Lowestoft's Bascule bridge was closed for around an hour on Sunday, after 'extreme heat' caused the bridge to get stuck.
Emergency services were alerted at around 2.50pm after the bridge, which is on the A12, got stuck.
Motorists were faced with heavy delays, as police diverted traffic to Oulton Broad and away from the bridge, which was closed in both directions.
A Highways England spokesman said the reason the bridge got stuck was due to the high summer temperatures.
They said: 'The A12 is the main road through Lowestoft, but extreme summer heat meant that the hinges on the bridge seiezed up.
'The emergency services knew exactly what to do and headed straight down to the site. Firefighters then hosed the bridge down, which cooled the hinges allowing them to operate again.'
The bridge re-opened just before 4pm, after the problem was rectified.
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