Predicted effectiveness countermeasure using traffic conflict techniques to improve traffic safety at 4- legs signalized intersections

Abstract EN

Improving road traffic safety has high effect to reduce the cost of traffic accident and save the user of highway.

Since 1985 the average stopped delay has been used as the measure of service in signalized intersections analyses, on the other hand it is difficult to evaluate the traffic safety in terms of change in number of traffic accident, because the traffic accidents accord has no reliable accident recorded, while it not only reflect the number of accidents well, but also their nature ; traffic conflict technique is an efficient tool for analyses traffic safety.

This study is aimed to developed traffic safety at 4 four- leg signalized intersections in Baghdad City.

Regression analyses is performed to relate hourly traffic conflict and average stopped delay .Specific categories of countermeasures such as signalization and geometric countermeasures are adopted.

HCS 2000 software are adopt to determine the average stopped delay before and after countermeasure implemented.

The results show that the negative exponential model related hourly traffic conflict to average stopped delay and show a better explanation rather than linear model, as well as it is found that exponential model explains increasing variation (81.6 ) of total hourly traffic conflict in relation with average stopped delay .

The highest reduction in number of traffic conflict after signalization countermeasures is 74.63 % more than the highest reduction after geometric countermeasures when it reduces by 58.07 %.

This study recommends using traffic conflict technique as a tool to improve traffic safety by any proposed countermeasures.