UPDATED: 10.45am. A person standing outside the safety railing on the Cambridge Road bridge over SH2A was rescued by police this morning.

He was on the Bethlehem side of the bridge, outside the safety barrier, standing there ready to jump, says a witness at the scene.

The woman who didn't want to give her name, says she stopped to call 111, and was amazed at how many people just carried on driving through.

Another woman who stopped tried talking to the man, before police intervened.

'They just ran onto the bridge and grabbed him,” says the witness. 'They leaned over the rail and grabbed him.

'I was amazed how many people just carried on driving. 'It was probably his car parked on the actual bridge, there was car parked on the bridge. People drove past him on the bridge, for God's sake.”

Earlier:

Cambridge Road, over SH2a, is blocked as emergency services deal with an incident.

A caller to the 0800 SUNLIVE news hotline says police are at the scene and motorists are being diverted from that stretch of highway.

Motorists are being warned to avoid the area if possible until the situation is resolved.

SunLive has emailed police for more updates.

We will update this story as soon as the road is re-opened.

At the scene?

Call 0800 SUNLIVE or email photos to newsroom@thesun.co.nz