For decades, Texas Department of Transportation districts have constructed auxiliary lanes to support interchange ramp operations and to resolve congestion proximate to freeway entrance and exit ramps. While auxiliary lanes are built throughout Texas, the existing roadway design manuals/guidelines do not present all of the necessary design tools and details for design engineers. The objective of this research project was to develop implementation-oriented guidelines on the use of auxiliary lanes. To fulfill this goal, the researchers (1) reviewed and synthesized national and peer states practices, (2) conducted a survey of traffic engineers, (3) analyzed operational benefits from adding auxiliary lanes at the segment level, (4) used micro-simulation to identify scope of impacts of auxiliary lanes at the corridor level, (5) analyzed safety impacts of adding auxiliary lanes, and (6) developed guidelines and recommended best practices. The outcomes of this study provide important recommendations and numerical tools (e.g., the look-up tables) in implementing and designing freeway auxiliary lanes for new construction or rehabilitation projects. The developed methodologies and outcomes will complement the provisions in current state roadway design manuals/guidelines.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Design and Scope of Impact of Auxiliary Lanes: Technical Report


    Contributors:
    Y Qi (author) / X Chen (author) / K.R Cheu (author) / Y Yu (author) / J Wu (author) / Y Wang (author) / H Liu (author) / G Liuu (author) / Y Lu (author)

    Publication date :

    2014


    Size :

    212 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English