Mr Coleman said there had been seven incidents, with the latest on June 19 involving a truck rollover causing traffic to stand still and the area to be blocked off for hours.
"With truck drivers ignoring the 3.8m clearance signs that have been in place for many years, I find it somewhat optimistic of the Public Transport Authority (PTA) to think that the installation of the new electronic signs will be a deterrent," he said.
"The rail bridge is a lot lower than the pedestrian and bicycle bridge and, as a result, is the one which is deceptive and sustains the damage."
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READ NOWPTA spokesman David Hynes said the most recent truck rollover beneath the underpass did not hit the bridge and it was the responsibility of all road users to be aware of the height of their vehicles and ensure they could travel safely underneath bridges. "The King William Street-Coode Street underpass in Bayswater is no exception," he said.
"Signage indicating the height of this underpass (3.8m) has always been prominently displayed.
"As a further measure, in September last year, we installed new white and red"strike-pattern" markings and a solar-powered LED flashing signage system on both sides of the bridge."
Mr Coleman said it would be a better policy to be proactive rather than reactive.
"Some truck drivers must not be aware of their own clearance level, so perhaps a bit of education is in order," he said. "Unfortunately human error will prevail in future accidents at this black spot.
"The metal rail bridge has many battle scars, but the most concerning damage is to the concrete supporting walls with large cracks and exposed rusty reinforcing bar."
The PTA spent $80,000 on the new markings and lighting.