ทัศนคติของผู้ใช้ทางพิเศษและประสิทธิผลของการตรวจจับความเร็วบนทางพิเศษ / ปภานันท์ ปรารมภ์ = Expressway driver attitudes and effectiveness of speed enforcement on an expressway / Papanun Prarom
This thesis studies attitudes of drivers towards expressway speed enforcement and the effectiveness of speed enforcement measures on an expressway. The first part’s objectives are to understand drivers’ attitudes and behaviors towards several speed enforcement measures from questionnaires. The results from 1,167 car drivers and 62 truck drivers show that 84% of car drivers and 76% of truck drivers either agree or be neutral with stricter speed enforcement policy on expressways. Also, the automatic speed camera measure and police speed trap would yield similar results. In addition, the results from ordered probit regression analysis show that some socioeconomic factors significantly related to drivers’ agreement on stricter policy. The later part concerns the before and after study of speed and accident reductions as a result of an automatic speed camera was installed at Bangpli-Suksawat Expressway. The speed data show that cars’ and trucks’ free flow speeds were reduced by 6.5 and 0.7 km/hr, respectively. In addition, accident rate per entering vehicle was reduced by 9.7%. The findings from this study will assist the Expressway Authority of Thailand in developing more appropriate and effective speed enforcement schemes on the expressways.