Abstract
The travel speeds selected and trusted by the driver vary according to his behavior and the surrounding environment. Accordingly, this paper studies the change of the free-flow speed, influences on it, of the route linking Al-Bayaa and Bab Almudam sectors. A GPS device was used to collect data during 60 rounds for three periods (morning, day, and night), 50 of them during the off-peak time and 10 during peak time with drivers of both genders and different ages. The results showed a variation of the FFS values at off-evening peak time, also noting the posted speed limits corresponding to the statistically calculated 85, which was 69km\hr. along the route. The emergence of a significant impact of the security checkpoints in link 3, causing a general defect in the traffic accounts. Also, there was an increase in the speed with an increase in lane width by 13% and a decrease in the speed with an increase in the number of lanes by 45.18% and 18.6% between 2 and 4 lanes and 2 and 3 lanes respectively. It should be noted that male is bolder and more reckless in choosing speeds by 26.32% than female and that groups of 50 and below years old choose less speed by 13.52% of ages 35 and below years old who are more confident and familiar in dealing with roads and choosing the appropriate speed.
Highlights
The great development of urban cities like Baghdad,diversity of land uses, tendency for private mode Caused an increase in traffic1.1
The results of the data extracted from the GPS showed in "Table .4", that the free-flow status is achieved at the time of the evening when the traffic flow is less than 500 vehicles per hour, and the headway is greater than 7 seconds [3]
The travel speed for drivers aged between 5035 years is 13.52% less than ages 25-35 and more by 8.37% from 25 years and below
Summary
The great development of urban cities like Baghdad,diversity of land uses, tendency for private mode Caused an increase in traffic1.1. The travel speed can be defined as the distance traveled between two points on a road divided by the travel time. Which differs from the running speed, including the times of stops and reactions. Any convergence between the two-speed values indicates the smoothness and comfort of the movement [3]. Free-flow speed (FFS), is known as the freerunning speed that the driver operates for a certain section of roads which are far from traffic control and traffic congestion area, under freeflowing, ideal weather conditions [4,5]. There are many ways for calculate free-flow speed, can be calculated as the post speed limits by adding 5 mph (8 km / h) or from the field geometric features of the road as indicated in the highway capacity manual [4], Nicholas J.
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