THE EFFECTIVENESS OF CCTV INFORMATION SIGN ON LOWERING VEHICLE SPEED (CASE STUDY THE CIPALI TOLL ROAD)

• Main Author: Maimunah Ma'ruf, Miftah
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/67940
• Institution: Institut Teknologi Bandung

Traffic crashes occurred on Cipali Toll Road during 2018-2020 were dominated by head-to-rear collisions. One of the influencing factors is the large speed difference between light vehicles and heavy trucks. Therefore, the Cipali Toll Road operator installed several CCTVs and CCTV information signs in several locations to observe vehicle movement and speed. The main purpose of this study was to evaluate the effectiveness of those CCTV signs on reducing the speed of light vehicles and heavy trucks by using N-gain Score method and Cohen's d Effect Size method. The result of this research indicate that in general the installation of CCTV information sign is not effective in lowering the speed of heavy trucks, but there is an inconsistency in the effectiveness of these signs in lowering the speed of light vehicles. On lane B, the installation of CCTV information sign is not effective in lowering the speed of light vehicles. However, on lane A, the installation of CCTV information sign effective in lowering the speed of light vehicles on weekends. This is indicated by the Cohen's d value of 0.88 and 0.96 for the peak and off-peak periods, which indicate large effectiveness. Meanwhile, on weekdays, the results of Cohen's d Effect Size shows that the installation of CCTV information signs is ineffective (in busy periods) or provides little effectiveness (during non-busy periods) in lowering light vehicle speeds. Meanwhile, the N-gain scores for lanes A and B on weekdays and weekends are 0.40 (medium effectiveness) and -0.45 (low effectiveness), respectively. This results is in line with the driver perception survey result conducted on 174 light vehicle and 18 heavy truck drivers. As many as 55% of respondents who drive light vehicles said that they slightly lower their speed when they see the CCTV information signs, while 89% of respondents who drive large trucks drive as usual without lowering their speed.