Seattle’s Trackless Electric Backbone

As some cities have pursued investments in modern streetcars, some critics have pointed to how buses can move more swiftly through mixed traffic compared to streetcars that are limited by where their steel rails allow them to travel.

A trolleybus, in some ways, is a nice half-step between a streetcar and a traditional bus, especially when relatively modest transit investments, like bus-only lanes and signal priority, can help speed vehicles through congested areas.