Development of Speed Models for Improving Travel Forecasting and Highway Performance Evaluation

Moses, Ren; Mtoi, Enock; Ruegg, Steve; McBean, Heinrich; FAMU-FSU College of Engineering (Tallahassee, Fla.). Dept. of Civil Engineering; Parsons Brinckerhoff

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Development of Speed Models for Improving Travel Forecasting and Highway Performance Evaluation

2013-12-01
By Moses, Ren ; Mtoi, Enock ; Ruegg, Steve ; ...

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Creators:

Moses, Ren ; Mtoi, Enock ; Ruegg, Steve ; McBean, Heinrich

Moses, Ren ; Mtoi, Enock ; Ruegg, Steve ; McBean, Heinrich Less -
Corporate Creators:

FAMU-FSU College of Engineering (Tallahassee, Fla.). Dept. of Civil Engineering ; Parsons Brinckerhoff

FAMU-FSU College of Engineering (Tallahassee, Fla.). Dept. of Civil Engineering ; Parsons Brinckerhoff Less -
Corporate Contributors:

United States. Federal Highway Administration
Subject/TRT Terms:

[+]

Free Flow Speeds Highway Capacity Highways I72: Traffic And Transport Planning Interrupted Flow Planning And Forecasting Traffic Flow Traffic Forecasting Traffic Models Traffic Speed Traffic Volume Uninterrupted Flow
Publication/ Report Number:

BDK83-977-14
Resource Type:

Tech Report
Geographical Coverage:

United States ; Florida

United States ; Florida Less -
TRIS Online Accession Number:

01502067
Edition:

Final Report
Corporate Publisher:

Florida. Dept. of Transportation
Abstract:

Most travel forecasting models require the use of appropriate values of free flow speed and practical capacity as well as appropriate forms of volume delay functions and their calibrated parameters. One-year field data of hourly volumes and hourly speeds from permanent traffic count stations maintained by the Florida Department of Transportation were used to determine the prevailing free flow speeds and practical capacities of highway facilities categorized by area type and facility type. The area types were grouped as rural, urban, and residential while facilities were categorized as uninterrupted flow facilities or interrupted flow facilities. Field data of speed and volume were plotted and used to fit and calibrate four volume delay functions (VDFs) - that is, Modified Bureau of Public Roads (BPR), Modified Davidson, Akcelik and Conical functions. The calibrated VDFs were then tested into the Florida Standard Urban Transportation Modeling Structure (FSUTMS) using the Orlando Urban Area Transportation Study (OUATS) region. The results of free flow speed and practical capacity estimation produced values that were in line with those found in published literature, although capacity on rural freeway segments could not be estimated because of uncongested operations on those segments. Updating the FSUTMS SPEEDCAP lookup table is recommended. Although the testing of the volume delay functions on the OAUTS region revealed a reasonable match between estimated counts and field counts for Modified BPR and Modified Davidson volume delay functions, the results need to be validated further due to lack of permanent count stations in the test region.
Format:

PDF
Collection(s):

US Transportation Collection
Main Document Checksum:

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urn:sha256:af037335b1ca04718b295b99aadb16de7a81d3f772f80fb908c2ff10fbfbf916
Download URL:

https://rosap.ntl.bts.gov/view/dot/40540/dot_40540_DS1.pdf
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Development of Speed Models for Improving Travel Forecasting and Highway Performance Evaluation

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