Bikers ride on part of the Great Highway that is now Sunset Dunes park on June 4. A bid by Supervisor Alan Wong to put a measure on the June ballot to reopen the road to cars failed.

Supervisor Alan Wong, center, speaks after being sworn in by Mayor Daniel Lurie on Dec. 1. Wong couldn’t get the required three other supervisors to support his ballot measure.

The effort to reopen the Great Highway is closed — for now.

Sunset Supervisor Alan Wong needed signatures from three colleagues on the San Francisco Board of Supervisors to place a measure on the June ballot asking city voters whether they want to reopen the Great Highway to cars on weekends and repeal what they approved in 2024.

By Tuesday’s 5 p.m. deadline, Wong could only muster the support of Supervisors Connie Chan and Chyanne Chen, but not Supervisor Shamann Walton, who told the Chronicle in September that he’s “100% behind going back to the ballot” to reopen the Great Highway to car traffic.

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So, what gives?

“There’s definitely a multilayer level of politics involved,” political consultant David Ho told me.

Walton said in a statement Tuesday that Wong’s initiative was “not well thought-out, introduced at the last minute and constantly changing.”

Another factor: Natalie Gee, Walton’s chief of staff,........

© San Francisco Chronicle