Throughout the past year, a number of newly paved roads in and around London were finished without the traditional center lines dividing traffic. According to a white paper published (PDF) by Transport for London (TfL), removal of center lines on roads where the speed limit is less than 30 miles per hour results in a "statistically significant reduction in vehicle speeds.”
Trials in Norfolk and Wiltshire have also supported the removal of the center line to reduce vehicle speed.
The TfL white paper found that drivers tend to slow their driving by up to 4mph on roads with no center lines. But, since the study was only conducted on smooth, newly-paved roads, the researchers at TfL corrected the data to account for the fact that drivers tend to go slightly faster when they feel confident that the road is in good condition. With such corrections, TfL found that the lack of center lines could theoretically reduce average vehicle speeds by up to 8.6mph.
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