EFFECT OF TRANSVERSE PAVEMENT MARKINGS ON SPEEDS OF VEHICLES APPROACHING TOLL GATES

• Main Author: Santoso, Agus
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/2780
• Institution: Institut Teknologi Bandung

EFFECT OF TRANSVERSE PAVEMENT MARKINGS ON SPEEDS OF VEHICLES APPROACHING TOLL GATES, Agus Santoso, 1992, Program Sistem dan Teknik Jalan Raya, Program Pascasarjana, InstitutTeknologi Bandung. Many accidents that occur at the Taman Mini toll gates on the Jagorawi toll road were considered to result from high vehicles speed when entering the toll gate area. Therefore, speed reduction guidance was introduced by placement of painted stripes across the road. The distances between stripes were arranged to obtain a 1 Ha. rate of crosssing when decelerating smoothly from design speed to stopping 50 m before the toll gates. This research attempt to evaluate whether the transverse pavement markings were effective in causing the expected deceleration. Several evaluations were carried out on speed parameters (mean, deviation, fastest range) using a before and after study design, to assess whether vehicle speeds after markings were within the criteria of design effectiveness. One of the evaluation methods was introducing t-hotelling test which could evaluate the speeds profile differences before and after markings. The analyses were carried out where possible by aggregating the data, separately for the before and the after study: It was found that speeds varied little by day of the week or by time of day, the speeds were different for three vehicle classes passenger cars, jeeps--minibuses-buses, and trucks in both the before and after studies. These vehicle classes were treated separately in the analysis: Although speeds of vehicles entering the marked area were lower than before, it was found that the markings were generally ineffective in reducing speeds of all vehicles along the marked area itself. They were also ineffective in reducing the speeds on the fastest 15 percent of vehicles. The markings also caused no reduction in the variation of speeds. These results applied to all three vehicle classes. It was concluded that the marking design did not invoke the expected response from drivers and it was suggested that effectiveness might be achieved in future by raised markings (rumble strips) or by increasing the frequency of the markings