Traffic analysis of two-lane highways

To read the full-text of this research, you can request a copy directly from the authors.


The analysis of huge rows of traffic data collected loop detectors we can get a lot of information about the traffic conditions of different highway sections. These equipments are able to measure the vehicle speed, following time and of course the traffic volume in different vehicle types. Such a measurement types are the best to choose those sections where catch the maximum value of vehicle traffic. Comparing our regulations to the HCM two basic differences can be noticed. Instead of A - E HCM LOS only two levels are used in Hungarian regulations. The tolerable (Fm) is the design level. The eligible (Fe) is the so called intervention level (when the capacity can only be risen with an intervention). The eligible capacity (2000 pcph) is significantly lower than the capacity of HCM (3200 pcph) recommendation. On the base of our results can be recommended to use the 3200 pcph HCM 2000 recommendation as the possible traffic volume also in Hungary. By these about 30% higher capacity values the network development can be planned more rational.

No full-text available

Request Full-text Paper PDF

To read the full-text of this research,
you can request a copy directly from the authors.

... Other than speed, traffic volume is one of the most studied factors in crash rate predictions [31,32]. Traffic volume, speed, and density are the three main parameters used for the characterization of traffic conditions [33]. Traffic conditions with high volume and high speed variation within the same lane represent conditions with lower levels of service and therefore unstable flow. ...
Full-text available
Lane changing of traffic flow is a complicated and significant behavior for traffic safety on the road. Frequent lane changing can cause serious traffic safety issues, particularly on a two-lane road section of a freeway. This study aimed to analyze the effect of significant traffic parameters for traffic safety on lane change frequency using the studied calibrated values for driving logic "conscious" in VISSIM. Video-recorded traffic data were utilized to calibrate the model under specified traffic conditions, and the relationship between observed variables were estimated using simulation plots. The results revealed that changes in average desired speed and traffic volume had a positive relationship with lane change frequency. In addition, lane change frequency was observed to be higher when the speed distribution was set large. 3D surface plots were also developed to show the integrated effect of specified traffic parameters on lane change frequency. Results showed that high average desired speed and large desired speed distribution coupled with high traffic volume increased the lane change frequency tremendously. The study also attempted to develop a regression model to quantify the effect of the observed parameters on lane change frequency. The regression model results showed that desired speed distribution had the highest effect on lane change frequency compared to other traffic parameters. The findings of the current study highlight the most significant traffic parameters that influence the lane change frequency.
... The accuracy of the results could be further increased by the simulation tests of higher traffic flow values and by using lower truck rates, as well as the scale units of exiting and entering traffic flow could also be refined. It would cause results resolution like other analyses [3]. It would also be possible to analyze sections including multiple exits and entries. ...
Full-text available
In this course of my current research, it is my intention to highlight how the most capacity-sensitive elements of highways should be designed in the function of traffic flow, exit and entry traffic flow and traffic composition. In addition to this, I also analyze whether it is sufficient - on the basis of the simulation test results - to design, and then to implement shorter or longer merging and diverging lanes.
... The traffic flow composition and the relevant presence of vehicle platoons is particularly interesting in traffic study, and more generally in Highway Engineering, with reference to a plethora of theoretical and practical applications. For instance, as for "traffic operations" [1][2][3][4], it is well known how the presence of platoons can influence breakdown probability [5,6]. Moreover, platoon analyses turned out to be important also in the study of car accidents and road safety [7]. ...
Full-text available
The traffic flow analysis and the relevant vehicle distribution (“free-moving” or “platooned” vehicles) on highway facilities at uninterrupted flow has always had fundamental importance in Highway Engineering, with special reference to topics like traffic operations, car accidents, road safety and air pollution emissions. In light of this, the study suggests a calculation algorithm as a random test generator to simulate a steady state traffic flow and to provide time headways. Thanks to the outcome produced by numerical simulations, we analysed platoon distributions within traffic flows in a steady-state regime and showed the results of numerical analyses carried out by traffic random process functions. The laws to determine “time headways” were obtained by the Pearson type III generalized distribution
Full-text available
Analysis of pedestrians is always a current issue, there are frequent crowded trams, tram platforms and long waiting time at zebra crossings. The unsignalized pedestrian crossing analyses are very important because these crossings have a crucial role in transport planning. The accident data show decreasing tendency in the pedestrian accidents although the decrease is not too significant. The rate of the pedestrian accidents on zebra crossings is significant; from 2009 to 2012 this rate was on zebra crossings between 32-34%. The VISSIM microsimulation analyses on unsignalised zebra crossings with and without refuge island. Based on the simulation results and international studies, these two facility types are compared. The article provides a recommendation for these facilities (zebra crossing with and without refuge island) for di_erent vehicle volumes and for medium and high pedestrian volumes.
Full-text available
A stochastic concept for highway capacity analysis is presented. The capacity of a highway facility is regarded as a random variable instead of a constant value. Thus, the stochastic approach provides new measures of traffic flow performance based on aspects of traffic reliability. A method for the estimation of capacity distribution functions from empirical data based on statistical methods for lifetime data analysis is introduced. This method is derived for the analysis of freeway capacity. However, the stochastic approach also is shown to be applicable to intersections. Results of the analysis of data samples from freeway sections in Germany indicate that freeway capacity is Weibull-distributed with a considerable variance. A Monte Carlo technique based on the stochastic description of capacity is proposed to quantify freeway traffic performance over a whole year. This technique also provides a quantitative assessment for oversaturated conditions.
By the analysis of the traffic data collected loop detectors we can get information about the capacities of different freeway sections. The results and the analysis of the measurements able to show the real maximum traffic volume:2300-2400 pcphpl. According to the recent regulations the maximum tolerable traffic volumes are much lower than these and lower than 2200 (capacity in HCM). We recommend using the HCM capacity values and the HCM Level of Services (LOS) categories in Hungary. By these 20% higher capacity value are more rational from the point of view of the national economy.
The "Highway Capacity Manual' (HCM) is the authoritative source providing state-of-the-art methodologies for evaluating highway, transit, bicycle, and pedestrian facilities. Default values are used to represent input parameters when the input parameters are difficult to measure or estimate. A default value is a representative value that may be appropriate for estimating an input parameter in the absence of local data. Before this study was done, no nationwide research effort had been conducted to assemble field measurements to determine whether the default values in the HCM represent typical field conditions. A sensitivity analysis was conducted for the input parameters in HCM 2000 that influence the service measures calculated in the HCM methodologies. Nineteen of these input parameters were determined to have a high degree of sensitivity in influencing the service measure results. These sensitive input parameters influence the service measures for the following HCM chapters: Urban Streets, Signalized Intersections, Pedestrians, Bicycle Paths, Multilane Highways, and Basic Freeway Segments. Based on the assembly of a nationwide database, specific default values were recommended for heavy vehicle percentages and peak-hour factors for uninterrupted flow facilities (freeways, multilane highways, and rural two-lane highways). It is recommended that default values for some input parameters continue to be developed based on existing HCM guidance. Other input parameters should be based on field measurements obtained from design plans. Additional guidance is provided to aid in the selection of default values based on the review of recent research documents.
The interpretations of the level of road service
  • Tóth-Szabó Zs
Tóth-Szabó Zs, The interpretations of the level of road service, Közúti és Mélyépítési Szemle 58, no. 7.
The determination of the level of road service by traffic measurements' data
  • D Jankó
  • Tóth-Szabó Zs
  • F Kovács
  • S Szénási
Jankó D, Tóth-Szabó Zs, Kovács F, Szénási S, The determination of the level of road service by traffic measurements' data, Közúti és Mélyépítési Szemle 58, no. 8.
  • Capacity Highway
  • Manual
Highway Capacity Manual, Transportation Research Board National Research Council, Washington, D.C., 2000.
Implementing the Concept of Reliability for Highway Capacity Analysis
  • W Brilon
  • J Geistefeldt
  • H Zurlinden
Brilon W, Geistefeldt J, Zurlinden H, Implementing the Concept of Reliability for Highway Capacity Analysis, Transportation Research Record: Journal of the Transportation Research Board, DOI 10.3141/2027-01, (to appear in print).
Default Values for Highway Capacity and Level-of-Service Analyses
  • J Zegeer
  • M Blogg
  • K Nguyen
  • M Vandehey
Zegeer J, Blogg M, Nguyen K, Vandehey M, Default Values for Highway Capacity and Level-of-Service Analyses, Transportation Research Record: Journal of the Transportation Research Board, DOI 10.3141/2071-05, (to appear in print).