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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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International Journal of Highway Engineering
Journal Basic Information
Journal DOI :
Korean Society of Road Engineers
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Volume & Issues
Volume 9, Issue 4 - Dec 2007
Volume 9, Issue 3 - Sep 2007
Volume 9, Issue 2 - Jun 2007
Volume 9, Issue 1 - Mar 2007
Selecting the target year
Road Accident Trends Analysis with Time Series Models for Various Road Types
Han, Sang-Jin ; Kim, Kewn-Jung ;
International Journal of Highway Engineering, volume 9, issue 3, 2007, Pages 1~12
Roads in Korea can be classified into four types according to their responsible authorities. For example, Motorway is constructed, managed, and operated by the Korea Highway Corporation. Ministry of Construction and Transportation is in charge of National Highway, and Province Roads are run by each province government. Urban/county Roads are run by corresponding local government. This study analyses the trends of road accidents for each road type. For this purpose, the numbers of accidents, fatalities, and injuries are compared for each road type for last 15 years. The result shows that Urban/County Roads are the most dangerous, while Motorways are the safest, when we simply compare the numbers of accidents, fatalities, and injuries. However, when we compare these numbers by dividing by total road length, National Highway becomes the most dangerous while Province Roads becomes the safest. In the case of road accidents, fatalities, and injuries per vehicle km, which is known as the most objective comparison measure, it turns out that National Highway is the most dangerous roads again. This study also developed time series models to estimate trends of fatalities for each road type. These models will be useful when we set up or evaluate targets of national road safety.
Development of Nth Highest Hourly Traffic Volume Forecasting Models
Oh, Ju-Sam ;
International Journal of Highway Engineering, volume 9, issue 3, 2007, Pages 13~20
For calculating the number of lane, it is essential to gain the 30th or 100th highest design hourly volume. The design hourly volume obtained from AADT multiplied by design hour factor. In this paper, we developed the regression models fur estimating the 30th highest hour volume and 100th highest hour volume as defined by AADT 50,000 criterion based on the data obtained the 34 monitoring sites in highway. By comparing the performance of the proposed models and conventional models using MAPE, the proposed model for 30th highest design hourly volume reduced the estimator error of 11.83% than that of conventional methods for less than AADT 50,000 and decreased estimation error of 22.17% than that of conventional method for more than AADT 50,000. Moreover, the proposed model for 100th highest design hourly volume reduced the estimator error of 8.16% than that of conventional methods for less than AADT 50,000 and decreased estimation error of 15.25% than that of conventional method for more than AADT 50,000.
Missing Imputation Methodologies for Daily Traffic Counts by Transforming Time Data into Spatial Data
Heo, Tae-Young ; Oh, Ju-Sam ;
International Journal of Highway Engineering, volume 9, issue 3, 2007, Pages 21~28
We suggest a new spatial linear interpolation method to substitute linear interpolation method which widely used in transportation engineering to impute the missing daily traffic volume. We layout daily traffic volume which is time series data over the virtual lattice space to consider the spatial correlation. We used Moran Index to evaluate the spatial correlations among daily traffic volume in same week and same date traffic volume by week considering the circularity of daily traffic volume. For real application, we used daily traffic volume on November, 2004 provided by Korea Institute of Construction Technology(KICT) and transformed daily traffic volume to 4 times 7 virtual lattice space to reflect the spatial correlation. Finally we showed that the spatial linear interpolation method has good performance for missing data imputation based on MAPE, RMSE, and Theil's U criteria.
A Study on the Installation Method of Delineation System Using Detection Distance and Lateral Position
Jeon, Woo-Hoon ; Cho, Hye-Jin ;
International Journal of Highway Engineering, volume 9, issue 3, 2007, Pages 29~38
This study investigated the effects of delineation systems on drivers' maneuver and how the effectiveness of delineation system can be further improved according to the road geometry. The experiments were conducted to collect lateral placement data and detection distance data using GPS equipped vehicles. The main results are summarizedas follows. Firstly, installing the delineation facilities on the roads helps drivers to recognize road alignment. Secondly, the detection distance is longer for delineators than for raised pavement marker in tangent section, while there is no difference in curve section. The chevron show the longest detection distance in the curve section, while the raised pavement markers showed no distinctive performance in terms of detection distance and lateral placement. Therefore, we can recommend install delineators in the tangent sections and chevrons in curve sections, based on the analysis results of effects of delineation facilities.
Study on the Analysis of Vehicle Impact to Small Sign Support
Ko, Man-Gil ; Kim, Kee-Dong ; Sung, Jung-Gon ; Yun, Duk-Geun ;
International Journal of Highway Engineering, volume 9, issue 3, 2007, Pages 39~50
Barrier VII program is normally used for the design of flexible barrier, but if modelled properly it can be used for the analysis of vehicle impact to small sign posts. In this paper sign post is shown to be modelled as flexible barrier by combining beam and column elements at each beam node. Simulations with the Barrier VII program have been made for 7 impact cases composed of sign posts of circular and H section with rigidly connected support and breakaway support system. The impact speed used for the simulation ranged from 30km/h to 110km/h. The study shows that in the vehicle impacts to a circular sign post with high speed, the large deflection and high inertia force causes the sign plate to hit the windshield leading to a hazard to the occupants. It is also shown that impact to H section post results in small deflection of the post and abrupt velocity change and high deceleration of the impact vehicle causing severe damage to both the vehicle and occupants. Simulation study also shows that breakaway support system eliminates the potential danger of the vehicle impact to the rigidly connected small sign posts by reducing deflection of the post, abrupt change in velocity and deceleration level.
Development of Tire/Pavement Noise Simulator
Kim, Young-Kyu ; Lee, Seung-Woo ; Yoo, Tae-Seok ;
International Journal of Highway Engineering, volume 9, issue 3, 2007, Pages 51~62
Recently various low-noise-pavement methods have been developed. Since tire/pavement noise is the major source of traffic noise at high speed condition, the core-technology of low-noise pavement is to produce the road surface texture that can reduce tire/pavement noise. The difficulties in the development of the low-noise pavements are high costs and time to construct test roads, since vehicles have to travel on the test roads to evaluate the noise from a particular condition of pavement surface. Tire/Pavement Noise Simulator were developed to overcome those difficulties and the reliability of developed Tire/Pavement Noise Simulator are investigated based on the simulating and measuring the noise of tire-tined concrete pavement and tire-non tined concrete pavement.
Quantification of the Value of Freeway VMS Traffic Information
Yoo, Tae-Ho ; Lee, Ki-Young ; Lee, Sang-Soo ; Oh, Young-Tae ;
International Journal of Highway Engineering, volume 9, issue 3, 2007, Pages 63~74
Traffic information provision plays an important role in increasing the efficiency of network operation and in providing convenience for roadway users. As a typical device for disseminating real-time traffic information for collective general public, VMS is a prevalent device nowadays and it is being expanded. However, the actual monetary value of traffic information is not quantified up to now. The previous studies regarding VMS traffic information are mainly focused on the behavioral aspects of road users such as departure time and route choices under traffic information provision conditions. This paper tried to estimate the monetary value of VMS traffic information using discrete choice theory and logit model through the stated preference study(SP). The methodological framework adopted in this paper can also be used in evaluating the monetary value of other traffic information providers including PDA, CNS, and mobile phone.
Study on Pollutant Characteristics of Tunnel Cleaning Wastewater and Removal Characteristics of the Pollutants via Settling and Adsorption
Park, Sang-Woo ; Choi, Young-Hwa ; Oh, Je-Ill ;
International Journal of Highway Engineering, volume 9, issue 3, 2007, Pages 75~82
Washed wastewater generated from the intermittent cleaning process of the three tunnel sites located in the Seoul area showed high concentrations of SS,
, Zn, Cu, Cr(+6), Mn, Mg, Phenol,
and E-Coli based on the water quality analysis. These characteristics of the deteriorative wastewater depend on the sampling method, cleaning frequency, released amount of washing water, inner material of tunnel wall, traffic volume, and type of drainage systems. Gravitational separation experiment of SS with collected tunnel wastewater showed considerable removal of pollutants such as 80% of
, 30% of T-N and 90% of T-P simultaneously. GAC isotherm test was conducted to remove dissolved portion of the pollutants, and resulted in high removal efficiencies above 80% of
, T-N, Zn, Cu, Mn, Phenol, CN in the experimental condition of GAC dosage of
Analysis of Bicycle Crossing Times at Signalized Intersections for Providing Safer Right of Bicycle Users
Son, Young-Tae ; Lee, JIn-Kak ; Lee, Sang-Hwa ; Kim, Hong-Sang ;
International Journal of Highway Engineering, volume 9, issue 3, 2007, Pages 83~89
When allocating traffic signal at the signalized intersection, minimum green time and clearance time for bicyclists should be significantly considered in order to enhance safety aspects to bicyclists when crossing intersections, especially where intersections with exclusive bicycle paths that are physically separated from pedestrians. In this study, field measurements related to bicycle crossing time, including minimum peen time and clearance time, were collected and analyzed according to bicycles crossing types at the signalized intersections where high rate of bicyclists exists. Three types of bicycle crossing are defined as follows 1) stopping: completely stop before crossing (at least one foot on found) 2) riding: crossing with riding bicycle 3) pulling: crossing without riding bicycles. Minimum green time based on pedestrian speeds should be used as crossing time in this case. For bicyclists, speed of bicycle that is applicable to estimate the minimum green time is in the 1.36m/sec(
percentile) to 1.60m/sec(
percentile) range in case of its stopping. Also it is in the 0.75(
percentile) to 0.87(
percentile) range for pulling at crosswalk. In addition, speed of bicycle to consider for calculating the clearance time is in the 2.51m/sec(
percentile) to 2.79m/sec(
percentile). These values also resulted from
percentile speeds of riding. The results of this study are expected to be supported in traffic signal allocation process, reflecting bicyclists' characteristics.
Study on the Design Method Development of Crash Cushion Using Single Degree of Freedom
Joo, Jae-Woong ; Kim, Ki-Jung ; Jang, Dae-Young ; Son, Seung-Neo ;
International Journal of Highway Engineering, volume 9, issue 3, 2007, Pages 91~100
The most important thing for driver's safety on the road is equipment of crash cushion as a vehicle protection safety facility. But development of crash cushion is defective because there's no rational and reality way of design. And also without an alternative plan, it rely on crash test hereby it suffers a great economic loss and wastes time. This study that uses data of cash test proves the suitability of single degree of freedom which considers the safety of passengers about three-dimensional complicated Crash Analysis. As the study analyzes the conduct of crash cushion, it want to develop the effective method of design on Single Degree of Freedom Crash Cushion. And it presents the way of crash cushion design through making a crash analysis model with single degree of freedom. To verify the validness of the crash cushion plan, with single degree of freedom plan, we make the level CC2 crash cushion and execute the crash test. A performance test brings satisfied result and a plan of single degree of freedom crash cushion is proven as an one of the way to be a good system which can design crash cushion.
Effect of Joint Spacing on Early-Age Behavior of jointed Concrete Pavement
Yoon, Chang-Ho ; Lee, Jae-Hoon ; Kim, Hyung-Bae ; Lee, Seung-Woo ;
International Journal of Highway Engineering, volume 9, issue 3, 2007, Pages 101~110
Joint Spacing of Jointed Concrete Pavement has been uniformly designed and constructed as six-meter in Korea. However, engineering backgrounds to show the appropriateness of six-meter Joint Spacing has not been provided. In the on-going reseach of the development of Korea Pavement Reseach Program(KPRP), the optimum Joint Spacing is suggested as 6 to 8 meters according to the regional climatic conditions based on the mechanical-empirical analysis of short-term and long-term pavement distress. This study is a part of the investigation on the adequateness of Joint Spacing design specification suggested in KPRP. Joint Spacing was design and constructed as seven-meter Joint Spacing suggested as design specification in Korea Reseach Program(KPRP) and monitored the Load Transfer Efficiency(LTE), Random crack and compared with those of adjacent
meter Joint Spacing concrete section.
A design guide to minimize frost heave in unbound pavement layers over box culverts
Seo, Young-Guk ;
International Journal of Highway Engineering, volume 9, issue 3, 2007, Pages 111~121
During the whole month of December in 2005, Korea experienced both heavy snowfall and freezing temperature in southeast regions, which had caused frost related damages to many pavements laid on top of box culverts. In-situ observation revealed that the formation of ice lenses in subgrade and subsequent unbound layers led to upward heaving and transverse cracks in concrete and asphalt pavements. This has affected the long-term performance of pavements, as well as has threatened drivers' safety for a while. Recently, Korea Expressway Corporation has proposed a design guide to better protect newly constructed unbound pavement layers over culverts from frost heave. A trench drainage system has been selected to effectively draw off water and to alleviate pore-water pressure in soils during the coldest season. This paper presents experimental and analytical backgrounds behind this new design guide. Soil specimens retrieved from the sites are tested to quantify clay content and to estimate the permeability of subgrade. A 2-D ground seepage analysis has been conducted to better understand the changes in pore water pressures as a function of grain size. Finally, an optimum size of trench drainage is determined based on numerical analysis and workability in the field.
Estimation of Rutting Property of Artificially-Aged Asphalt Mixtures Based on LMS(%) and
Jung, Jae-Hun ; Park, Tae-Won ; Doh, Young-Soo ; Kim, Kwang-Woo ;
International Journal of Highway Engineering, volume 9, issue 3, 2007, Pages 123~134
This study was carried out for evaluating correlation of aging level and deformation resistance of asphalt mixtures conditioned by artificial aging treatment. The specimens were made of the short-term aged loose asphalt mixture which was kept in a convection oven at
for 2 hours, and then were artificially aged at
for 24, 48, 72 and 96 hours for long-term aging. Deformation strength (
) and large molecular size ratio (LMS(%)) were measured after short-term and each long-term aging treatment to evaluate aging extents of each mixture with aging time using GPC(Gel-permeation chromatograph) test. It is shown that the
and LMS(%) were increased with aging time increment, and that LMS(%) quantity and
have relatively good correlation each other. This study found that the aged asphalt mixture had better resistance against rutting and it was possible to estimate rutting characteristics of asphalt mixtures by using LMS(%) without a binder recovery.
Behavior of Precast Prestressed Concrete Pavements under Post-Tensioning
Kim, Seong-Min ; Cho, Byoung-Hooi ;
International Journal of Highway Engineering, volume 9, issue 3, 2007, Pages 135~143
The pavement system constructed by tieing a number of precast concrete slabs employing prestressing techniques is called the precast prestressed concrete pavement. The behavior of this type of pavement system under post-tensioning was analyzed using a finite element model. First, the optimal number of anchors was determined by investigating the distribution of compressive stresses in the pavement system due to post-tensioning. Then, the effects of the parameters such as the horizontal resistance of underlying layers, the pavement length, the slab thickness, and the bearing area of the anchorage on the distribution of compressive stresses were analyzed. The horizontal resistance of underlying layers induced the loss of compressive stresses, and the loss increased in the middle of the pavement. As the pavement length increased or the slab thickness decreased, the stress loss due to the horizontal resistance of underlying layers became larger. However, the bearing area of the anchorage where the compressive forces were applied did not much affect the distribution of compressive stresses.