Improving the Traffic Operations and Safety of Ramps and Speed Change Lanes – A Review of State Design Practices

Baker, Michael

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Improving the Traffic Operations and Safety of Ramps and Speed Change Lanes – A Review of State Design Practices

1980-09-01
By Baker, Michael

File Language:

English

Details

Creators:

Baker, Michael
Corporate Creators:

Michael Baker Jr., Inc.
Contributors:

Boenau, Ronald E.
Corporate Contributors:

United States. Department of Transportation. Federal Highway Administration. Office of Research
Subject/TRT Terms:
Publication/ Report Number:

FHWA-RD-79-127
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

Interim Report
Contracting Officer:

Boenau, Ronald E.
Corporate Publisher:

United States. Department of Transportation. Federal Highway Administration. Office of Research
Abstract:

This interim report presents the results of a review of ten selected state highway design manuals, discussions with state design and traffic operation engineers and a literature review with specific attention given to ramp and speed change lane criteria. For comparison, additional documents from the American Association of State Highway and Transportation Officials (AASHTO) and Canada were reviewed. A summary of the review and analysis of the manuals is provided along with a detailed discussion of selected design parameters of ramps and speed change lanes. The review determined that the manner in which individual design elements are fitted together can be improved provided that a complete section of roadway (e.g. a ramp) be designed to insure that a proper smooth speed transition (SST) exists. This can be done by studying a proposed design from beginning to end and recording the speed transitions expected.
Format:

PDF
Funding:

DOT-FH-11-9183
Download URL:

https://rosap.ntl.bts.gov/view/dot/67467/dot_67467_DS1.pdf
File Type:

[PDF - 2.22 MB]
Collection(s):

Federal Highway Administration
Main Document Checksum:

urn:sha-512:c082d5a83af121ca438b93f532185cee10f3d381054abfd6251419ca976e6747e5d800be053a300e35ae18c7fcae7278c5d3ee34ec20a2ff49f2add0f9707ac0

File Language:

English

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