Principal Investigator: Anuj Sharma
Sponsors & Partners
Mid-America Transportation Center
About this Project
Brief Project Description & Background
Trucks have significantly higher fatality rates than any other surface mode of transportation. This research aims at improving the safety of trucks at high speed isolated intersections.
A new and improved surrogate measure dilemma zone hazard function was recently proposed by the author of this proposal. The dilemma hazard function is a stochastic function estimating the probability of traffic conflict that can have varying severity level at certain spatial location. This research will develop dilemma hazard function for trucks. This research will also compare the effect of intersection geometry and environment on the hazard function. These results will then be documented as charts for use of the practitioner to design the operation of high speed isolated intersections
Intersection crashes constitute a 30% of all the vehicle crashes ; they account for an average of 9,000 fatalities and 1.5 million injuries annually. Red light running (RLR) and rear-end crashes are typical to an isolated high speed intersection. A typical intersection has approximately 700~800 instances of main-street phase terminations every day where high speed driver approaching isolated intersections have to decide whether to stop or go. An erroneous decision to go can possibly lead to a severe right angle crash. And a wrong decision to stop can possibly lead to a serious rear-end crash. The variation in vehicle kinematics and drivers characteristics further complicates this problem. This research will assessing the risk of crash on trucks at the onset of yellow taking into consideration the vehicle types. This research would be enhancing the safety of trucks.
This project aims at assessing the risk of crash for trucks on the onset of yellow at high speed isolated intersection. The dilemma hazard function so determined would serve as an important parameter for designing dilemma zone protection systems. Drivers need to make a decision to stop or go on the onset of yellow. An erroneous decision to stop when it would have been safer to proceed can lead to severe rear end collisions. Similarly an erroneous decision to go when it would be advisable to stop can lead to red light running incidences and T-bone collisions. Trucks are relatively less maneuverable and have lower available acceleration and comfortable deceleration rate. The line of sight of truck or bus drivers is much higher than passenger vehicle and they may have difficulty in responding to the brake lights of the leading car. So, trucks are at a higher risk of crashes in above situations. Dilemma zone protection systems are used at high speed intersection to enhance the safety of operation. Dilemma zone boundaries are typically used as surrogate measure of safety. This is a binary approach used to decide whether or not there is a risk of crash. However, this approach does not quantify the magnitude of risk associated with a specific spatial location. This research proposes a detailed analysis of risk of crash associated with trucks on the onset of yellow light at a high speed intersection. This research will use the concept of traffic conflict to enumerate risk of crash for trucks.