Road Safety: Intersections Essay

1016 Words 5 Pages
In modern days, society is entrusted with the responsibility of using one of the most accessible pieces of potentially dangerous pieces of machinery. With the rates of injuries and fatalities caused by vehicles continuously increasing, it has become the role of engineers to evaluate and improve the measures taken to prevent further damage. One major aspect of road safety is intersections, where the possibility of collisions is very high. 20% of all accidents occur within 100m intersections (K.W Ogden, 2001). The intersection that will be discussed in this report is the Broadwater Rd and Newnham Rd intersection at Wishart. This intersection is subjected to steep inclines and in some cases sight distance was largely hindered, resulting in a very unsafe intersection. Hence, to improve this intersection, speed limits have been proposed along with an appropriate duration of the orange light to prevent potential accidents.
Stopping Distance
The method that has been used to determine the speed limits and the duration of the orange light considers the stopping distance of vehicles. Stopping distance comprises of recognition, reaction and braking, which are represented in Dr.Dan’s formula (Logbook). These components are dependent of various factors. For example, the driver relies on sight distance to be able to comprehend the intersection and recognize the reason to stop. Therefore, in this analysis, sight distance has been considered. Furthermore, reaction time depends…