Main Roads have released a two stage plan to fully open the bridge this month.
The Mandurah Bridge traffic lane layout will be changed to fully open in two stages this month.
On Wednesday December 6 traffic was moved onto the two outside lanes of the bridge to enable final road works to be completed safely on the new bridge.
During this temporary arrangement, the northern lane is carrying east-bound traffic, and the southern lane is carrying west-bound traffic.
Stage two will happen before Christmas, with all four lanes open to traffic.
Traffic management signage will be in place at all times to guide motorists.
Removal of the old bridge is continuing and will be completed in January 2018, then landscaping, path and boardwalk works will continue through to February.
Main Roads have released this picture, showing traffic flow in stage one, and then stage two when the bridge is fully operational.
Women injured in serious North Dandalup crash
Daughter of man allegedly stabbed to death in East Rockingham pays tribute to father
Peel Thunder claim fourth WAFL premiership
Man dies after suspected stabbing in East Rockingham
City of Rockingham cracks down on illegal dumpers
Missing Mandurah girl found safe and well
Police hunt for man who threatened staff with knife during Falcon armed robbery
Authorities descend on Memorial Drive homeless camp, move on notices issued
Locals asked to have their say on new concept designs for Lakelands Youth Park