[4] It originally carried bidirectional traffic while the older Murrow Bridge underwent extensive renovations.

[5] The lanes were opened to all Mercer Island commuters, including single-occupant vehicles, per a 1978 agreement negotiated by the city government.

[7] The reversible lanes were planned to be converted for light rail use at a future date, but design issues prevented a simple conversion from being feasible.

When this section of the 2 Line, scheduled to be completed in 2025,[10] begins operation, it will be the first permanent railroad on a floating bridge.

The express lanes were closed to road traffic on June 5, 2017, rebuilt for light rail and are dedicated for the trains of "East Link Extension" (opening planned in 2025).