Evaluation of Bus Bulbs

Document Type


Publication Date


Subject Area

operations - traffic, infrastructure - stop, economics - appraisal/evaluation, place - north america, mode - bus


Before and after studies, Bus stops, Case studies, Design, Field studies, Future, Innovation, Location, North America, Research Traffic simulation


This report will be of interest to individuals and groups with a stake in the location and design of bus stops. These groups include public transportation organizations, public works departments, local departments of transportation, developers, and public and private organizations along or near bus routes. The research evaluated bus bulbs, an innovation in the design of bus stops found in several major North American cities. A bus bulb is a section of sidewalk that extends from the curb of a parking lane to the edge of a through lane. They are also known as curb extensions, nubs, and bus bulges. Chapter 1 introduces the research objectives, scope, and approach. Chapter 2 presents the findings from the site visits, the curbside and roadway before-and-after studies, and the traffic simulation program. Chapter 3 presents the conditions that support the construction of bus bulbs and the conditions that would not support the use of bus bulbs. Chapter 4 summarizes the findings from the research and suggests further research. The report's Appendix A is a review of selected cities' practices.


Permission to link to report given by TRB.