This research paper has evaluated the effectiveness of the advisory speed limit at a two-way two-lane rural highway. Advisory speed limits are usually used on roads with some complex conditions, such as on horizontal curve. Even though driving over advisory speed limit is not a violation, over advisory speed limit would easily cause accidents or uncomfortable. In this research, the vehicle speeds at horizontal curve of different time duration are analyzed. The data collection sites are located on rural highway 77 and 665, and the speed limits of them are 70 mph. The results in the research indicate that there are more vehicles that follow the advisory speed limit at day time non-peak hour and night time than day time peak hour. Moreover, there are more vehicles that follow the advisory speed limit at the horizontal curve which the advisory is 65 mph than the curve which the advisory is 55 mph. As a result, at day time non-peak hour and night time, when the advisory speed limit is 65 mph, the advisory speed limit is higher than the drivers’ expectation. However, when the advisory speed limit is 55 mph, the advisory speed limit is lower than the drivers’ expectation.
July 3, 2014
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