Council members Brad Lander, Stephen Levin and Margaret Chin want to double the width of the path that is shared by bicyclists and walkers.
They unveiled their plan Monday. It calls for designating three-quarters of the widened lane to pedestrians and the rest to cyclists.
The Department of Transportation says about 4,000 pedestrians and 3,100 cyclists use the path each day.
The number of pedestrians, cyclists and tourists on the bridge has surged in recent years. The path is above the center of six lanes of vehicle traffic.
The council members offered no cost estimate. It could take years to make the change due to the span's landmark designation.
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