For any vehicle type the speed distribution is an important parameter that has a significant influence on roadway capacity and achievable travel speeds. If not hindered by other vehicles, a driver will travel at his desired speed (with a small stochastic variation called oscillation). If overtaking is possible, any vehicle with a higher desired speed than its current travel speed is checking for the opportunity to pass without endangering other vehicles. The intent of desired speed study is to determine the speeds that drivers select when unencumbered by traffic congestion. Thus, such studies are taken for vehicle type CAR under conditions of free flow (light traffic) within the network.