Using Vehicle Probe Data to Evaluate Speed Limits [Project Summary]

Fitzpatrick, Kay; Kutela, Boniphace; Park, Eun Sug; Pratt, Michael P.; Venglar, Steven P.; Le, Minh

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Using Vehicle Probe Data to Evaluate Speed Limits [Project Summary]

2024-08-01
By Fitzpatrick, Kay ; Kutela, Boniphace ; Park, Eun Sug

File Language:

English

Details

Creators:

Fitzpatrick, Kay ; Kutela, Boniphace ; Park, Eun Sug ; Pratt, Michael P. ; Venglar, Steven P. ; Le, Minh
Corporate Creators:

Texas A&M Transportation Institute
Corporate Contributors:

Texas Department of Transportation. Research and Technology Implementation Office ; United States. Department of Transportation. Federal Highway Administration
Subject/TRT Terms:
Publication/ Report Number:

0-7156
Resource Type:

Brief
Geographical Coverage:

United States
Edition:

Project Summary
Corporate Publisher:

Texas. Department of Transportation
Abstract:

When speed limits are set via an engineering speed zone study, the operating speed for a site is needed. This research project investigated whether probe speed data (rather than speeds measured in the field) could reasonably be used in a speed zone study. The idea for using probe speed data is to develop conversion equations that would convert an average yearly speed measure obtained from probe speed data into a speed measure that would represent free-flow conditions for passenger cars. Equations for85th percentile speed and average speed were created for freeway and non-freeway facilities, each subdivided into urban and rural contexts, and their performances were evaluated. For freeways, the adjusted R-squared values for the regression equations indicate that the independent variables used in the models can explain between 77 and 92 percent of the observed speed variability. Further, the values for the root mean square error implies that, on average, the predicted speeds are off by 2.6 to 2.9 mph, which are lower than the suggested incremental speed limits (5 mph).
Format:

PDF
Download URL:

https://rosap.ntl.bts.gov/view/dot/78980/dot_78980_DS1.pdf
File Type:

[PDF - 182.01 KB]
Collection(s):

US Transportation Collection
Main Document Checksum:

urn:sha-512:3020d17b814e7c8033076f610b4726d91686658a847aea7a8922ebcff002f5dde8d41c620442445ef3b923c74c0ebe0d6a8fb4bd9ed35f05373967c11813ae17

File Language:

English

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