Impact Assessment of Driver Distraction by Cellphone on Start-up Lost-time and Average Saturation Headway at Signalized Intersections Based on Vehicle Position in the Queue

Cellphone usage has a significant impact on signalized intersections' capacity and level of service. This study investigated the cellphone intersection service in Dammam Metropolitan Area, Saudi Arabia. The data included 183 useful cycles 2407 start-up lost time average saturation headway values at with without 24 intersections. main hypothesis is that increases capacity. secondary Normal distribution z-test were conducted to assess whether there increase time. found about 0.7 seconds but no due usage. Also, as vehicles users get closer stop line Thus, decreases progression 13 per hour reduction effective green time, total delay, deteriorates can assist transportation traffic officials optimize signal operation mitigate improve urban transportation.