TRB/APTA study: A Proposed Design Alternative for Inserting Dedicated Light Rail Transit Lanes and Other Facilities in a Constrained Arterial Roadway

San Francisco's N-Judah light rail transit (LRT) line provides a model of how 2-track LRT can be fitted into a narrow arterial. Photo: Eric Haas.

San Francisco’s N-Judah light rail transit (LRT) line provides a model of how 2-track LRT can be fitted into a narrow arterial. Photo: Eric Haas.

How can dedicated lanes for a 2-track light rail transit (LRT) line be inserted into a relatively narrow 75 to 80-ft-wide arterial street or roadway, while maintaining basic 2-lane traffic flow capacity in each direction? Plus facilities for pedestrians and bicycles?

LRN technical consultant and Railway Age online writer Lyndon Henry describes how in a proposal prepared for the 13th National Light Rail & Streetcar Conference co-sponsored by the Transportation Research Board and American Public Transportation Association, to be held next week in Minneapolis, Minnesota. Titled A Proposed Design Alternative for Inserting Dedicated Light Rail Transit Lanes and Other Facilities in a Constrained Arterial Roadway, the proposal will be presented in the Complete Streets session on Monday, Nov. 16th. Here’s an abstract of the report:

Plans for inserting new light rail transit (LRT) tracks and other facilities directly into existing streets and arterial roadway s often encounter the problem of constrained right-of-way. This can present a serious challenge, especially when maintenance of basic traffic lane capacity is desired together with dedicated transit lanes. This paper suggests, as an example, a design solution that may be applicable or adaptable to similarly challenging situations. In a right-of-way width limited to 80 feet/24.2 m , inserting dedicated lanes for LRT while maintaining four traffic lanes plus adequate pedestrian and bicycle facilities was a significant design challenge. The proposed solution utilizes the adaptation of a very similar example of San Francisco’s Muni Metro (LRT) N-Line running in Judah Street. It also relies on Best Practices from several existing LRT systems and other sources such as the National Association of City Transportation Officials.
Hopefully the design concept described in this paper may be useful to the intended audience in suggesting a possible approach to solving similar problems involving the installation of LRT alignments in constrained arterial roads. It is expected to have applicability, potential adaptability, and transferability for a broad range of North American communities confronting similar design challenges.

Both a copy of the paper and the PPT presentation can be downloaded here (as PDFs):

Proposed Design (paper):
LH_Design-alternative-dedicated-LRT_doc-public

Proposed Design (PPT):
LH_Design-alt-LRT-in-arterial_ppt-public