Reevaluation of Ramp Design Speed Criteria: Review of Practice and Data Collection Plan

Hunter, Michael; Machemehl, Randy B.; Tsyganov, Alexi; University of Texas at Austin. Center for Transportation Research; Texas. Dept. of Transportation. Research and Technology Transfer Office

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Reevaluation of Ramp Design Speed Criteria: Review of Practice and Data Collection Plan

1999-12-01
By Hunter, Michael ; Machemehl, Randy B. ; Tsyganov, Alexi

[PDF-1.88 MB]

English

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Details:

Creators:

Hunter, Michael ; Machemehl, Randy B. ; Tsyganov, Alexi

Hunter, Michael ; Machemehl, Randy B. ; Tsyganov, Alexi Less -
Corporate Creators:

University of Texas at Austin. Center for Transportation Research ; Texas. Dept. of Transportation. Research and Technology Transfer Office

University of Texas at Austin. Center for Transportation Research ; Texas. Dept. of Transportation. Research and Technology Transfer Office Less -
Corporate Contributors:

United States. Federal Highway Administration
Subject/TRT Terms:

[+]

Acceleration Lanes Data Collection Design Speed Distance Highways I73: Traffic Control Merging Traffic On Ramps Operations And Traffic Management Ramp Metering Ramps Ramps (Interchanges) Traffic Lanes
Publication/ Report Number:

FHWA/TX-98/1732-1
Resource Type:

Tech Report
Geographical Coverage:

Texas ; United States

Texas ; United States Less -
TRIS Online Accession Number:

00933877
Edition:

Research Report September 1, 1998-August 31, 1999
Corporate Publisher:

United States. Federal Highway Administration
Abstract:

Current freeway entry ramp design speed criteria were evaluated through observations of twenty ramps in four Texas cities. Field observations of ramp and freeway traffic speed-distance relationships were made using videotaping methods. Traffic operations were described in terms of ramp and freeway right-lane speeds and accelerations, as well as ramp driver merging locations, accepted time gap sizes, and freeway time headways. The researchers determined that observed ramp driver acceleration rates and AASHTO values were comparable. For virtually all observations, ramp driver speeds are found to be greater than 50% of the freeway design speed, leading to a recommendation that the design policy provision allowing ramp design speeds to be as small as 50% of the freeway design speed be deleted. The ability of entry ramp drivers to see, prior to reaching the ramp gore, freeway right-lane traffic, into which merging is intended, was found to be very important. This finding led to a recommendation that the AASHTO acceleration lane should be considered to begin only when ramp drivers have an unobstructed view of freeway right-lane traffic.
Format:

PDF
Funding:

0-1732
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:c5a4f9cc22f65bd67fdbe38e8536ebec1d35f4a84a3a6121c36ea419297a9730
Download URL:

https://rosap.ntl.bts.gov/view/dot/42167/dot_42167_DS1.pdf
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Reevaluation of Ramp Design Speed Criteria: Review of Practice and Data Collection Plan

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