Officers from Essex Police were called to reports of concerns for a man on a bridge over the road near to Junction 26 shortly after 11.15am today (Tuesday 10 October).
Officers attended and worked to resolve the situation as quickly and as safely as possible.
This meant the road had to be closed for the safety of all those involved, including road users.
The man was brought to safety at around 4.50pm and the road was re-opened.
A man in his 50s has been arrested on suspicion of intentionally and recklessly causing a public nuisance and is in custody.