A lorry was badly damaged when it became wedged under a low bridge.
Some of the roof was ripped off the 7.5-tonne vehicle owned by transporters TNT.
PC Nick Kendall said the lorry was going the wrong way up Trafalgar Street when it got stuck under the curved bridge under the forecourt of Brighton station.
He said No Entry signs normally in place at the entrance to the bridge were not there.
Traffic built up in the area as the top of the road was closed off for several hours.
Before the lorry could be removed, the tyres had to be let down and roof struts removed from the lorry.
No one was injured and there was no structural damage to the bridge.
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