Author(s):
1. Dragana Božić, Serbia
2. Vladan Tubić, Saobraćajni fakultet Univerziteta u Beogradu, Serbia

Abstract:
Speed as one of the basic parameters of a traffic flow is of great importance in terms of efficiency (service level, travel time) and safety (number, consequences and risk of accident occurrence). Speed management includes a series of measures that are applied with the primary goal of achieving the balance between safety and efficiency in the traffic flow. One of the most important managerial measures for achieving this goal is to define a credible constraint, that is, a speed limit that would allow the maximization of the capacity and level of the service of the observed section, ie minimizing the cost of users and the risk of occurrence of traffic accidents. Considering the fact that improper and unadjusted speed causes a number of significant negative effects, the aim of this work is to carry out the analysis of the credibility of the existing constraints, ie to determine the factors that influence the speed on sections with two-lane valley roads. In order to achieve the results, field research in real-world conditions was carried out using the mobile observation method using the application on the android phone. In addition to the analysis of cross-section value of the velocity (medium time speed), the analysis of the traffic flow velocities on the entire homogeneous influencing section from ABS (micro level) as well as on the macro level, ie along the six analyzed sections of two-way roads valley roads that are placed out of town (medium spatial speed). Also, empirical research has determined the speed limit values on selected sections and free speeds based on the Linear Model, as well as the application of the HCS software. With in the framework of the speed analysis, the values of exploitation speeds were determined based on analytical models and methods. In order to get a clearer picture of the credibility of the existing constraints, an analysis of the overrun of limited speeds by classes has been carried out.

Key words:
speed limit credibility, operating speed, speed managment, hourly design volume

Date of abstract submission:
15.10.2019.

Conference:
VIII Međunarodna konferencija Bezbjednost saobraćaja u lokalnoj zajednici

Final paper