Safety implication of vehicles exceeding operating speed at different number of access in two lane carriageway

• Published in: AIP Conference Proceedings
• Main Author: Rahim A.M.A.; Adnan M.A.; Sulaiman N.; Nazaruddin A.; Zulqarnain F.
• Format: Conference paper
• Language: English
• Published: American Institute of Physics Inc. 2018
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85055475553&doi=10.1063%2f1.5062644&partnerID=40&md5=7c6bd01603067baa3ae2bcfa1464de54

Speed has been identified as a key risk factor in road traffic injuries and an increase in average speed typically results in higher risk of a crash involving injury. The relationship between speed and road safety is very consistent as when speed goes down, the number of accidents or injured road users also goes down and vice versa. The selected study area was at Federal Road 5 (FR5) in Kapar Town to Jeram to identify safety implication of vehicle exceeding operating speed at different number of access for this stretch road. The spot speed survey station was located at three locations with different number of access. Data on traffic volume and spot speed was conducted on minimum 200 vehicles passing to achieve 95% confidence level at each location in 15 minutes interval has been recorded and analyse. Statistical analysis method was conducted by using Minitab programme. All parameters involved were filled in into Minitab prior to the calculation of the t-test and regression statistical analysis. From the data analysis, the highest 85th percentile speed was captured at location 1 and location 2 for first 0 -15 minutes, both shared the same value with 90km/h. Its shows that drivers were driving at higher speed at straight road stretch than curved road. Meanwhile, based on the multiple regression model, it shows that the coefficient for the predictor variable number of access as a negative sign, implying that an increase in the number of access, will lead to a decrease in the 85th percentile speed and flow rate has a positive sign implying that an increase traffic volume flow rate at certain stretch, will lead to an increase in the V85 operating speed. The t-test results show that the p-value is less than the 0.05 (in this case it is 0.00) which indicates a statistical significance difference in the speed between straight and curved road stretches. © 2018 Author(s).