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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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International Journal of Highway Engineering
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Journal DOI :
Korean Society of Road Engineers
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Volume & Issues
Volume 13, Issue 4 - Dec 2011
Volume 13, Issue 3 - Sep 2011
Volume 13, Issue 2 - Jun 2011
Volume 13, Issue 1 - Mar 2011
Selecting the target year
Effect of Environmental Conditions on Expansion of Mortar-bar by Alkali-Silica Reaction
Kim, Seong-Kwon ; Yun, Kyong-Ku ; Hong, Seung-Ho ; Kang, Moon-Sik ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 1~6
DOI : 10.7855/IJHE.2011.13.3.001
The possibility of ASR(alkali-silica reaction) for coarse aggregates had known to be low up to recently in Korea. But the distress of ASR was identified and reported by ASTM C 1260 test. The purpose of this paper was to identify the effect of environmental conditions on length expansion of mortar-bar by alkali-silica reaction with KS F 2546 and ASTM C 1260 test. The results of this study were as following; The result of KS F 2546 test for five kinds of aggregates shows that all of them are non-reactive. But that of ASTM C 1260 test shows that all of aggregates except Andesite-2 are over possible reactive because of environmental condition such as external alkali ion by 1N NaOH, high temperature and humidity. The result of variety of NaOH concentration on ASTM C 1260 using Siltstone indicates that length expansion rate increases highly as NaOH concentration increases. And, comparison results of KS F 2546 for Siltstone with that of 0.00N NaOH experiment indicates that length expansion rate increases as temperature and humidity increases.
Numerical Analysis of Curling Behavior of Prestressed Approach Slab Subjected to Environmental Loads
Park, Hee-Beom ; Eum, In-Sub ; Kim, Seong-Min ; Rhee, Suk-Keun ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 7~14
DOI : 10.7855/IJHE.2011.13.3.007
The numerical analyses were performed to investigate the curling behavior of the post-tensioned prestressed concrete approach slab (PTAS) under environmental loads. A technique to include properly the boundary conditions of one end of PTAS that was connected to the bridge abutment using hinges was proposed for the numerical model. The applicability of a simplified model not having hunches was also investigated. By using the developed models, the curling behavior of PTAS was analyzed when the foundation settlement occurred. The analysis results showed that the maximum tensile stress obtained from the simplified model involving a simplified hinge connection was very closed to that obtained from a rigorous model. When the slab curled up, the maximum tensile stress occurred in the model including no foundation settlement, but when the slab curled down, the maximum stress occurred in the model including partial settlement of the foundation. Therefore, the design of PTAS should be performed considering those maximum tensile stresses.
Dynamic Analysis for Evaluation of Speed Control Hump Dimensions
Shim, Jae-Soo ; Choi, Hyun-Gyu ; Kim, Seong-Min ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 15~20
DOI : 10.7855/IJHE.2011.13.3.015
This study was conducted to evaluate the characteristics of installation dimensions of speed control humps based on the theoretical dynamic analyses. The field surveys of speed control humps were performed first to compare their sizes with those suggested in the installation standard. Then, the displacement response spectra under impact loads were obtained using the single degree of freedom models where the vehicle and human were assumed to combine completely. The analysis results showed that the human perception became larger as the width and height of the humps increased, but the extremely higher uncomfortableness should be avoided. In addition, the ratio between the width and height should be considered when the humps are designed and installed because the ratio governs the vertical acceleration magnitude.
Structural Analysis of Concrete-filled FRP Tube Dowel Bar for Jointed Concrete Pavements
Park, Jun-Young ; Lee, Jae-Hoon ; Sohn, Dueck-Su ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 21~30
DOI : 10.7855/IJHE.2011.13.3.021
As well known, dowel bars are used to transfer traffic load acting on one edge to another edge of concrete slab in concrete pavement system. The dowel bars widely used in South Korea are round shape steel bar and they shows satisfactory performance under bending stress which is developed by repetitive traffic loading and environment loading. However, they are not invulnerable to erosion that may be caused by moisture from masonry joint or bottom of the pavement system. Especially, the erosion could rapidly progress with saline to prevent frost of snow in winter time. The problem under this circumstance is that the erosion not only drops strength of the steel dower bar but also comes with volume expansion of the steel dowel bar which can reduce load transferring efficiency of the steel dowel bar. To avoid this erosion problem in reasonable expenses, dowers bars with various materials are being developed. Fiber reinforced plastic(FRP) dower that is presented in this paper is suggested as an alternative of the steel dowel bar and it shows competitive resistance against erosion and tensile stress. The FRP dowel bar is developed in tube shape and is filled with high strength no shrinkage. Several slab thickness designs with the FRP dowel bars are performed by evaluating bearing stress between the dowel bar and concrete slab. To calculated the bearing stresses, theoretical formulation and finite element method(FEM) are utilized with material properties measured from laboratory tests. The results show that both FRP tube dowel bars with diameters of 32mm and 40mm satisfy bearing stress requirement for dowel bars. Also, with consideration that lean concrete is typical material to support concrete slab in South Korea, which means low load transfer efficiency and, therefore, low bearing stress, the FRP tube dowel bar can be used as a replacement of round shape steel bar.
Functional Drainage Evaluation of Block Paving through the Usage of Sludge and Wheel Tracking Test
Lee, Sang-Yum ; Jung, Hoon-Hee ; Mun, Sung-Ho ; Park, Dae-Geun ; Park, Kyong-Min ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 31~38
DOI : 10.7855/IJHE.2011.13.3.031
As the percentage of permeable ground is reduced due to the increased impermeable roads of major cities, a heat island phenomenon can be dominantly observed, resulting in increased temperature. In addition, rainfall that would have been naturally absorbed and retained by the permeable ground is overflowed due to large volumes of run-off water, resulting in more sewer failures and increased erosion. In terms of permeable pavement system, block paving has been used anywhere as well as provides many years of service. The permeable block paving is an effective alternative to the more traditional asphalt or plain concrete for minor roads; furthermore, it looks a lot better than other pavements. In this study, the functional drainage evaluation of block paving was carried out, considering the usage of experimental sludge and wheel tracking test, in order to simulate the field condition of roads.
A Study on the Structural Design of Permeable Asphalt Pavement
Lee, Soo-Hyung ; Yoo, In-Kyoon ; Kim, Je-Won ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 39~49
DOI : 10.7855/IJHE.2011.13.3.039
The porous pavement system is widely considered very effective in urban street because of its various benefits on safety and environment, but the pavement thickness design system has not been established yet. In porous pavement system. rainwater penetrates to the subgrade through porous pavements layers. Porous pavements are expected to reduce or alleviate the problems caused by impermeable pavement layer such as flood damage due to heavy rain in the city, drainage load, disorder in ecosystem, and heat island. However, its structural design methods in traffic roads has not been made mainly because of not being able to consider adequately the effect of rainwater on subgrade strength. In this study, structural design method of porous pavements is suggested after considering the subgrade weakness due to rainwater and numerical mechanical analysis. It is noted that elastic modulus of subgrade is reduced by 20% as subgrade moisture content is increased by 2% at optimum moisture content in the literature review. As a result of both finite element analysis and strength loss of subgrade by the existing design method, it is necessary to increase subbase thickness about 30cm in porous pavements compared with the existing traffic road pavement system. It is similar to premium thickness of structural design of porous pavements in Japan.
A Suggestion of Mix, Construction Method and Quality Control Criteria of Fine-size Exposed Aggregate PCC Pavement by Experimental Construction
Lee, Seung-Woo ; Kim, Young-Kyu ; Choi, Don-Hwa ; Shim, Jae-Won ; Yoo, Tae-Seok ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 51~63
DOI : 10.7855/IJHE.2011.13.3.051
Surface of fine-size exposed aggregate portland cement concrete pavements(FS-EAPCC) is consist by exposed coarse aggregate to remove upper 2~3mm mortar of concrete slabs. Advantages of FS-EAPCC are maintaining low-noise and adequate skid-resistance level during the performance period. However, FS-EAPCC is required rational management criteria for field application, since it is early stage for application. Design construction and quality control criteria of FS-EAPCC was temporary laboratory tests which including optimum mix and exposing method, selection of adequate aggregate, resistance against, environmental loading and etc. However, these criteria need to be validated base on field application. In this study, experimental constructions were performed and construction procedure and quality control criteria were suggested based on the performance of the FS-EAPCC.
A Study on Performance Warranty Criteria for Expressway Jointed Concrete Pavements
Yeo, Hyun-Dong ; Ahn, Deok-Soon ; Suh, Young-Chan ; Jeong, Jin-Hoon ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 65~73
DOI : 10.7855/IJHE.2011.13.3.065
Recently, researches to introduce the performance warranty contract are in progress for quality improvement of road pavements. The performance warranty contract is a type of contract in which contractors guarantee to maintain certain level of performance during a period from completion of construction. The contract use in Europe and the U.S is being increased because it has been known to contribute to improvement of structure quality, reduction of life cycle cost, development of construction techniques, and etc. The research on performance indicators, threshold values, and warranty durations is essential to effectively introduce the contract in Korea. In this study, literatures on the performance warranty contract for concrete pavements of the Minnesota, Indiana, and Florida of the U.S. were reviewed. Major distresses influencing the pavement performance were investigated and analyzed in the jointed concrete pavement sections of 21 Korean expressway routes to be compared to the performance indicators, threshold values, and warranty durations of the states. More accurate comparison is expected by investigation in planned sections for a long time.
Abrasion-Resistant Road Markings for Improved Durability Lane to Wear Simulators Test
Lee, Chang-Geun ; Park, Jin-Hwan ; Oh, Heung-Un ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 75~82
DOI : 10.7855/IJHE.2011.13.3.075
There is the uncertain period of the construction in case of the products meeting the quality standard of KS M 6080, the quality is degraded because of the abrasive loss of the paint caused by vehicle tires as the traffic amount increases and of the loss and detachment of the glass beads providing the retroreflective function. The abrupt degradation of visibility causes the high frequency of traffic accidents at night and increases the traffic accident rate. Additional supplementary construction induces the direct material and construction costs. As the more cost induction effect than the direct cost, the traffic jam caused by the additional construction increases the indirect social costs such as time cost and vehicle cost. Hence, the study is concerned with performing the abrasion resistance test based on the EN 1436 standard to check and improve the quality of various road marking materials resulting in improving the durability of road marking materials. However, even though the difference in the durability lifetime of resins(binders) is bibliographically or theoretically clear, there was no difference in the durability lifetime (retroreflectivity aspect) of the road marking paint using these binders. The reason is that the bonding of beads was very insufficient or that the cross density caused by crack or freshness was low. Moreover, the measured wet retroreflectivity was distributed as the Rw3 or higher class in average on the basis of EN 1436 but was very insufficient on the basis of the minimum wet threshold retroreflectivity with 100mcd/(
) managed overseas.
Development of A Estimation Method of Traffic Demand Between ICs and An Algorithm for Providing Traffic Information
Lee, Jun ; Cho, Han-Seon ; Kwon, Young-In ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 83~91
DOI : 10.7855/IJHE.2011.13.3.083
The objective of VMS(Variable Message Sign) is to provide the traffic information downstream to drivers upstream so that they can choose their routes or expect the travel time to arrive the destination. Because there is not enough time and space to show the message, VMS message should be selected carefully. However, the message of VMS has been simply selected among the pre-designed message sets based on the priority rule of events. If the traffic demand between origin and destination is identified along the freeway, message can be selected to provide the information of a route that more drivers will use. In this study, a time sliced OD(Origin/Destination) estimation method will be developed using the detector information of the on-ramp, exit ramp, and the main lanes. And the strategy of a priority rule of message was planned.
Developing Bike Road Design Alternatives Considering Land Use Characteristics
Kang, Kyeong-Mi ; Kim, Eung-Cheol ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 93~102
DOI : 10.7855/IJHE.2011.13.3.093
The Korean government recently has focused on variety of policies to promote the use of bikes to control the emission of carbon. However, bike facilities with no regard to the safety and comfort of bike drivers has made inefficient bike roads. Also, the accidents related to bikes have increased rapidly. This study proposes the proper types of the bike roads considering land use and bike driver characteristics. The elements classifying the bike driver characteristics are driven through oneway ANOVA and cluster analysis. It is found that the types of the bike roads can be classified by the ratio of child and elderly bikers and the ratio of heavy trucks. Also, the each type is characterized by the land use types such ad residential, commercial and industrial areas through cluster analysis. According to the results of the cluster analysis, installation of bike roads in residential area needs to consider convenience and safety simultaneously. It is also found that convenience should be the most considerable factor in commercial area. Lastly, safety should be considered in industrial area. Recommended methodology and bike road type based on the land use and bike driver's characteristics can be useful to develop bike-friendly environments and increase mode share of bikes.
Accident Models of Circular Intersections by Type in Korea
Han, Su-San ; Kim, Kyung-Hwan ; Park, Byung-Ho ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 103~110
DOI : 10.7855/IJHE.2011.13.3.103
This study deals with the traffic accidents by type. The objectives are to analyze the characteristics of 2 accident types, and to develop the models by type. In pursuing the above, this paper gives particular attentions to testing the differences between by type two groups, and developing the models (Poisson and negative binomial regressions) using the data of domestic circular intersections. The main results are as follows. First, the number of accidents in vehicle vehicle was analyzed to account for about 73.41% of total and to be higher than vehicle people. Second, two Poisson models and two negative binomial models which were all statistically significant were developed using vehicle people accidents and vehicle vehicle accidents as dependant variables. Finally, the traffic volume as common variable was selected in the models, and right-turn slip lane, speed hump, the number of driveways, the number of pedestrian crossings as specific variables of the models were selected.
The Study for the Realtime Noise Simulation Integration Model Applied to Traffic Simulation and Spatial Modeling
Kang, Tae-Wook ; Cho, Yoon-Ho ; Kim, In-Tai ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 111~119
DOI : 10.7855/IJHE.2011.13.3.111
The noise prediction model, KRON-2006, in South Korea has been developed for obtaining the average noise level. The model is based on an outdoor sound propagation method based on ISO9613 and ASJ Model-1998 and supports the analysis of the linear noise source, such as highway, for obtaining Leq. Because of that, the model can't obtain Lmax, Lmin from the time series noise profile based on traffic at every moment. In order to address this problem, the real time noise prediction model based on traffic simulation using GIS model and algorithm is proposed. It can predict the vehicle point noise level based on vehicle type, speed generated from traffic simulation by using headway and obtain Lmax, Lmin as integrating the noise profile generated from it at every moment. An evalution of the noise prediciton model using field measurements finds good agreement between predicted and measured noise levels at 1m, 8m, 15m from curb of the near side lane.
A Model for Estimating NOx Emission Concentrations on National Road
Oh, Ju-Sam ; Kim, Byung-Kwan ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 121~129
DOI : 10.7855/IJHE.2011.13.3.121
The purpose of this study is to determine the relationship between observed traffic data and NOx concentrations from not an ideal condition but a real road in real-time. Also we aim to develop an estimation model for NOx emission concentrations due to vehicle exhaust gas, and it can be applied to monitor the degree of air pollution on National Road in real-time. To eliminate outliers which are occurred due to errors of equipments and other variables, we use the robust analysis and develop two models. which are considering and not considering wind impact. The result of this research can be used for understanding present condition of air pollution caused by vehicle exhaust gas and evaluating for environmental effects of transportation policy.
A Study on Delay Time Building of Underpass for Small Car
Lee, Young-Woo ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 131~137
DOI : 10.7855/IJHE.2011.13.3.131
The development of underground space essentially leads to increase in construction cost and installation of a large structure also acts as a factor deteriorating fine sight of the city. Accordingly, there recently is a trend to make city center structures light and small if possible. In this study, for efficient development of underground space, we analyzed the change in the average delay time in comparison to the existing underpass and the influence thereof using a microscopic simulation software VISSIM 5.20 after controlling heavy vehicles not to use the underpass and to detour using the intersection above the underpass, and gradually increasing the ratio of heavy vehicles in accordance with v/c of the access road in order to examine efficiency of introducing an underpass exclusive to small cars at an underground road installed and being operated in a city road area, and presented installation standard for underpass exclusive to small vehicles adequate to the traffic characteristics. Considering the findings of the study, introduction of underpass exclusive to small cars judged to be beneficial in the aspects of reduction in the economic loss resulting from land purchase, environmental damage due to construction of large traffic structures and environment-friendly green traffic.
Risk Analysis of Travelling Vehicles by Cross Wind
Lee, Il-Keun ; Jo, Byung-Wan ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 139~146
DOI : 10.7855/IJHE.2011.13.3.139
Travelling vehicles on roads may slip or overturn due to strong cross wind. This paper presents the path deviation equation and the overturning equation of vehicle, and the process of evaluating the cross wind risk. Case studies for cars and trucks are carried out. It explains the mechanism why the deviation occurs according to the types of vehicles. It shall help to prepare the measures for reducing the risk of travelling vehicles in high wind speeds.
The Effects of the Urban Spatial Structure on Traffic Congestion Costs
Lee, Tae-Kyung ; Won, Jae-Mu ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 147~156
DOI : 10.7855/IJHE.2011.13.3.147
Since the urbanization process has been taking place, negative outcomes such as environmental pollution and traffic congestion have produced as well. Reflecting the phenomenon, our study assumed that physical structure of urban form were implicit in relation to both economic performance and cost. It can be interpreted that as the urban space has been growing bigger, economic performances such as regional product output, economy of scale and the effect of agglomeration economies are increased. On the contrary, the negative effects such as environmental pollution and traffic congestion were incurred as economic loss and expenses. It means that even though economic performance can help increase regional product output, we should consider the loss on economic expenses which are paid for social problems such as environmental pollution and traffic congestion, which are caused by urbanization. Therefore, this study aims to statistically validate the relationship between traffic congestion as the most representative economy costs and physical characteristics of urban in a large city such as Seoul and to suggest its implications. As a result of model development for empirical analysis, GRDP(0.604), the population(0.582), employment GINI coefficients(0.296), population GINI coefficients(0.254) in order led to congestion cost. We can come to the conclusion that in case of scale factor such as the population, if the population tends to concentrate, urban becomes more crowded and that if GINI coefficients (the population, employment) which are variable on inequality according to region have the disparity with surrounding areas, congestion cost is caused a lot on account of movement related with employment. In addition, this phenomenon was caused if both the population and employment were geographically biased on one side.
A study on the factor analysis by grade for highway traffic accident
Lee, Hye-Ryung ; Kum, Ki-Jung ; Son, Seung-Neo ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 157~165
DOI : 10.7855/IJHE.2011.13.3.157
With respect to the trend of highway traffic accident, highway accident is in decline, whileas, the fatality is on an increasing trend. Thus, many efforts to decrease highway traffic accidents and improve the safety, are required. In particular, in case of highway, the management standard by grade for accident black spot is designated. Thus, investing the effect factors by grade for highway traffic accident is required in detail. Thus, in this study, the factors affecting the traffic accidents among the environmental factors based on the graded data for the accident black spot in the applicable section targeting the Seoul-Pusan Express Highway, were reviewed; accident forecasting model which would analyze the characteristics of the accidents for determining the accident grade, was developed. As a result of establishing a model by using Quantification Theory of Type II, considering the characteristics of the dependent and independent variables based on the geometric structure, 'the fixed variable' among the variables relating to the accident, for the variables influencing over the accident grade, 'the type of vans, a chassis and people', 'the trailers, special vehicles and chassis people' and 'the negligence of watching and cloudy weather' were analyzed as common factors, in case of 'horizontal alignment', 'longitudinal slope' and, 'barricade' respectively.
Drivers Detour Decision Factor Analysis with Combined Method of Decision Tree and Neural Network Algorithm
Kang, Jin-Woong ; Kum, Ki-Jung ; Son, Seung-Neo ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 167~176
DOI : 10.7855/IJHE.2011.13.3.167
This study's purpose is to analyse factors of determination about detouring for makinga standard model in regard of unfavorableness and uncertainty when unspecified individual recipients make a decision at the time of course detour. In order to achieve this, we surveyed SP investigation whether making a detour or not for drivers as a target who take a high way and National highway. Based on this result, we analysed detour determination factors of drivers, establishing a combination model of Decision Tree and Neural Network model. The result demonstrates the effected factors on drivers' detour determination are in ordering of the recognition of alternative routevs, reliable and frequency of using traffic information, frequency of transition routes and age. Moreover, from the outcome in comparison with an existing model and prediction through undistributed data, the rate of combination model 8.7% illustrates the most predictable way in contrast with logit model 12.8%, and Individual Model of Decision Tree 13.8% which are existed. This reveals that the analysis of drivers' detour determination factors is valid to apply. Hence, overall study considers as a practical foundation to make effective detour strategies for increasing the utility of route networking and dispersion in the volume of traffic from now on.
Comparison of Vehicle Carbon Emissions in Expressway and National Highway
Lee, Yoon-Seok ; Oh, Heung-Un ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 177~184
DOI : 10.7855/IJHE.2011.13.3.177
There are several differences between freeways and general national roads in terms of structures, conditions and limited speeds. Likewise, the characteristics of
emission in these roads differ depending on the road types. For these reasons, it is necessary to compare the two types of roads in terms of
emissions. The study was performed targeting Gyeongbu Expressway and National Highway 1. Firstly, the amount of
emission each car was compared in the whole sections of the both. Secondly, top 10 sections were picked out, and then
emission each section were compared. Lastly, two sections which were with the highest and lowest amount of
emission per car, were compared. As results, it were found that there were less amount of
emission on freeways. because cars are running on uniform velocity at relatively high speed, and that there were more amount of
emission on the national highway. because of frequent intersections and associated congestion. It may be concluded that the amount of
emission at the national highway could be reduced if signal coordination and intersection intervals are improved there.
A Comparative Study on Fuel Consumption Depending on The Use of Lift Axle
Oh, Ju-Sam ; Eo, Hyo-Kyoung ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 185~193
DOI : 10.7855/IJHE.2011.13.3.185
As a Lift axle is an additional axle installed mostly in heavy freight truck, It"s introduced for the purpose of cost saving, such as logistics, fuel, tire wear and prevention of the pavement damage. However, the Effects of a lift axle are anecdotal and they have occurred often that a lift axle is used improperly by expectations of some drivers. For these reasons, this study conducts a field experiment in order to identifying the change rate of fuel consumption due to an a Lift axle using, develops the fuel consumption model of field data, and then compares the effects of a Lift axle using through application of the model. As a result, fuel consumption decreased in loading conditions that are both empty and full when not using a lift axle.
Estimation of Capacity at Two-Lane Freeway Work Zone Using Traffic Flow Models of Each Vehicle-Type
Park, Yong-Jin ; Kim, Jong-Sik ;
International Journal of Highway Engineering, volume 13, issue 3, 2011, Pages 195~202
DOI : 10.7855/IJHE.2011.13.3.195
The purpose of this study is to estimate the capacity of two-lane freeway work zone blocking one lane using traffic flow models of each vehicle-type. Firstly, three traffic flow models of three different vehicle-types were developed using the data collected from each at the beginning and the ending point of the work zone. For each model, the maximum flow rate of three vehicle-types were calculated respectively. Maximum flow rate at the work zone was recalculated using passenger car equivalent value and percentage of vehicle-type. Secondly, traffic flow model using passenger car equivalent volume data was developed using the data collected from each at the beginning and the ending point of the work zone. Maximum flow rate for the work zone was calculated along. Two values of maximum flow rates through the work zone were compared and evaluated as the capacity of the work zone. This study found that the maximum flow rate of the work zone at the beginning point was less than that at the ending point because of impedance such as lane changing behaviors before entering the work zone. The capacity of two-lane freeway work zone blocking one lane was estimated 1,800pcphpl.