Design and scope of impact of auxiliary lanes : technical report.
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2014-06-01
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Abstract: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.
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