What feature may be present on some city transit buses to enhance safety?

A brake door interlock system is designed to enhance safety on city transit buses by preventing the bus doors from opening while the vehicle is in motion. This feature ensures that passengers cannot accidentally exit the bus when it is not stopped, reducing the risk of accidents as they disembark. By requiring the bus to be fully stopped and in a safe condition before the doors can open, this system plays a crucial role in protecting both passengers and pedestrians.

Other features, while beneficial, may not primarily focus on safety in the same direct manner. For instance, a speed limiter regulates the maximum speed of the bus, which helps maintain safe driving speeds but does not specifically guard against entry or exit-related accidents. Automatic doors enhance convenience and assist with the boarding process, but they do not provide the same level of safety assurance as a brake door interlock system. A dual steering system, typically used for backup in case of steering failure, is more about control than safety related to passenger entry and exit.