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Street | Speed Limit |
85th Percentile Speed |
Vehicle Count |
Date of Study |
---|---|---|---|---|
Central Ave / Fairview Ave | 35 mph |
34 mph |
18,689 |
2013-Aug. |
Central Ave / Fairview Ave | 35 mph |
34 mph |
18,988 |
2013-Oct. |
Central Ave / Serpico Way | 35 mph |
37 mph |
16,935 |
2014-Aug. |
Central Ave / Westerly Ave | 35 mph |
33 mph |
18,313 |
2014-Sept. |
Central Ave / Westerly Ave | 35 mph |
34 mph |
18,618 |
2014- Oct. |
Central Ave / Serpico Way | 35 mph |
33 mph |
16,935 |
2013-May |
Lathrop Ave / Sunset Pl | 25 mph |
24 mph |
330 |
2015- Nov. |
Longview Ave / Rosedale Ave | 25 mph |
23 mph |
1,200 |
2013-June |
Maple Ave / Kings Rd | 25 mph |
25 mph |
1,747 |
2015-Dec. |
Morris Pl / Wisteria Ct | 25 mph |
33 mph |
6,261 |
2013-May |
Niles Ave / Pine Tree Terr | 25 mph |
28 mph |
5,592 |
2014- Sept. |
Noe Ave / Crestview Ave | 25 mph |
35 mph |
17,029 |
2014-July |
North St / Myrtle Ave | 25 mph |
32 mph |
4,595 |
2015-July |
Park Ave / Anthony Dr | 35 mph |
39 mph |
71,145 |
2013- Jan. |
Park Ave / Cedar Ave | 35 mph |
42 mph |
61,998 |
2013-Jan. |
Prospect St / Belmont Ave | 25 mph |
33 mph |
33,296 |
2013- Dec. |
Ridgedale Ave / Myrtle Ave | 30 mph |
35 mph |
38,891 |
2013-March |
Vinton Rd / Wilson La | 25 mph |
32 mph |
3,095 |
2015-May |
• What does the 85th percentile speed mean?
The 85th percentile speed is the speed at or below 85 percent of vehicles travel.
Another way of looking at this is that only 15 percent of vehicles go faster than this speed and 85 percent go at or below this speed. According to a Federal Highway Administration study, all states and most local agencies use the 85th percentile speed of free flowing traffic as the basic factor in establishing speed limits.
• Why is the 85th percentile speed a good basis for the speed limit?
Studies have shown crash rates are lowest at around the 85th percentile speed. Drivers traveling significantly faster OR slower than this speed are at a greater risk for being in a crash. It is not high speeds alone that relate to crash risk; it is the variation of speed within the traffic stream.
• Would lowering the speed limit affect the speed of vehicles?
A change in the speed limit almost always changes the mean speed of traffic. However, the changes are not always proportional. For the most part, the change in the mean speed of traffic created by a change in speed limit is around 25 percent of the change in the speed limit. In other words, a speed limit increase or reduction of 6 mph (10 km/h) yields about a 1.5 mph (2.5 km/h) raising or lowering of the mean speed, respectively.
References: R. Elvik, P. Christensen, and A. Amundsen, "Speed and Road Accidents: An Evaluation of the Power Model," The Institute of Transport Economics (TOI), TOI Report 740/2004 (December 2004).
Federal Highway Administration (FHWA), Methods and Practices for Setting Speed Limits: An Informational Report