Section 7: Freeway Corridor Enhancements

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This section discusses other transportation modes and includes discussions on where to find information on planning and design criteria for these modes.

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Freeways with High Occupancy Vehicle Treatments

High Occupancy Vehicles (HOV) lanes are a commonly used approach in urban freeway environments to reduce congestion and travel times.

Guidelines for the planning and designs of HOV facilities are given in AASHTO’s Guide for the Design of High Occupancy Vehicle Facilities and in the Guidance for Future Design of Freeways with High Occupancy Vehicle (HOV) Lanes Based on an Analysis of Crash Data from Dallas, Texas, by the Texas Transportation Institute (TTI), 2004. Note that a Design Exception would be required if the desirable lane and shoulder widths shown in the AASHTO Guide for the Design of HOV Facilities are not met.

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Light Rail Transit

Light Rail Transit systems are being considered in some urban environments as an approach to reducing congestion and travel times.

Guidelines for the incorporation of light rail transit systems in the transportation network are given in the Transit Cooperation Research Report by Lawrence G. Lovejoy, P.E., TCRP Report 155, Track Design Handbook for Light Rail Transit, Second Edition, Transportation Research Board, National Academy Press, Washington, D.C., 2011.

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Peak Hour Lanes

Part-time shoulder use is a transportation system management and operation (TSM&O) strategy that allows use of the left or right shoulders as travel lanes during some, but not all, hours of the day.

Guidelines for the use of part time shoulders are given in Use of Freeway Shoulders for Travel - Guide for Planning, Evaluating, and Designing Part-Time Shoulder Use as a Traffic Management Strategy, FHWA-HOP-15-023, Federal Highway Administration, Washington, D.C., 2016.

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Tolled Express Lanes

Tolled express lanes are typically a “freeway-within-a-freeway” where the express lane(s) are separated from the general purpose lanes. A number of design approaches are available depending on policies for pricing, vehicle eligibility, and access control.

Guidelines for the implantation of tolled express lanes can be found in Managed Lanes Primer, FHWA-HOP-05-031, Federal Highway Administration, Washington, D.C., 2008.

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