Analytical Models to Increase the Speed Limit on Freeways and Its Impact on Travel Safety Promotion

Operating speed-driving leads to death or serious injuries. However, a clear picture to show speed leads to an accident there, the high cost of accidents on a daily basis paid by communities in different ways. Has caused improve the safety of the main goals is transportation planners. The database collected, based on two studies "Tehran - Qom" and "freeway of Karaj - Qazvin" just sweep a model, so the effect of increasing the speed limit on suburban road safety be investigated. For this purpose, the factors including traffic volume, brightness, age, number of lane, speed of movement of vehicles, shoulder, etc. have been chosen to model. Then, based on surveys and field studies and completing the necessary information in the fields, variables determine the final model calibration and presented. The final model for the natural logarithm function form has been created that includes variables such as: average daily traffic volume, vehicle speed limit, speed of movement of vehicles, road pavement quality index and percentage of heavy vehicles are driven on the moon.