Streets with predictable bus delay due to peak-period motor vehicle traffic, particularly due to queuing.
Streets with high peak-period bus frequency and generally high traffic volumes.
Streets with curbside loading, vending, high-turnover parking, or other important but physically flexible activities that can be relocated at some times.
Streets where offset lanes are not desired, such as where significant curbside transit stop improvements have been made.
Curbside peak-only lanes are most important on streets with one lane in each direction and parking. On commercial streets with more than one lane and parking, the assignment of a full-time or part-time offset bus lane with in-lane stop infrastructure may provide an advantage for both transit operations and local business and public life activity.
Peak-only lanes are not preferred on streets with narrow sidewalks and no sidewalk furnishing zone, as the absence of parking may place pedestrians uncomfortably close to traffic.
Peak-only bus lanes provide a large boost to transit capacity at critical times, substantially improving both reliability and transit travel times on streets where congestion at peak causes transit delays.
Peak-only bus lanes allow stationary uses such as metered parking, freight loading, and street vending during non-peak periods.
Peak-only bus lanes are conducive to active transit signal priority treatments.
Wider lanes can accommodate off-peak bicycle lanes adjacent to curbside parking, and shared bus-bike lanes during peak periods.
Curbside peak-only bus lanes involve a trade-off between faster peak travel times and slower off-peak bus travel times, with slower pull-out stops during off-peak times. Corridors without heavily peaked traffic volumes may be better off with bus bulbs, which have moderate benefits 24 hours a day, than with peak-hour bus lanes, which have larger benefits for two to six hours per day.
Curbside bus lanes typically preclude installation of curb extensions.
Because bus stops are typically located directly on the adjacent sidewalk, enough room must be available for waiting passengers, stop amenities, and passing pedestrian traffic.
Peak curbside lanes typically replace peak-period parking, and have neutral traffic impact or may even increase traffic capacity.