An early-morning protest by construction flaggers saw major traffic backups leading into Vancouver Thursday morning.

About 60 flaggers demonstrated at the side of Highway 1 westbound near the Port Mann Bridge.

The construction workers are urging people to slow down and pay attention. The demonstration snarled traffic along the heavily-used route, but the group says it was necessary to raise awareness to the dangers they face on the job.

"If drivers slowed down in the first place in construction zones we wouldn't have to do this," flagger Diane Herback told CTV News.

Herback says signs at sites urging drivers to slow down are not effective.

"Us flaggers are fed up. Hopefully our government wakes up and says we need to do something for our traffic controllers."

RCMP spokesperson Cpl. Peter Theissen said there was a police presence at the event to ensure public safety was maintained.

The protest was sparked after an accident last Friday when a female flagger was struck by a speeding vehicle in Delta.

She remains in critical condition in hospital.

The protest ended shortly before 7 a.m.

With files from The Canadian Press