From the Wikipedia “Suicide bridge” article:

Bridges that are “suicide magnets” include the Jacques Cartier Bridge in Montreal, and the Duke Ellington Bridge in Washington, D.C..

To reach such locations, those with the intention to commit suicide may pass over other bridges, even taller ones. There are a number of cases of people travelling over the San Francisco-Oakland Bay Bridge to reach the Golden Gate, for instance. While this may not make utilitarian sense, it is consistent with hypotheses that people considering suicide may sometimes choose a specific scenario for their suicide rather than suicide by any comparable method per se.