ROAD works will impact drivers getting on the Mitchell Freeway southbound in Stirling for the next two months.
The Karrinyup Road freeway on-ramp will be reduced to a single lane and 40km/h speed limit from 10am to 7pm weekdays until June 30.
The works are part of the freeway southbound widening project and will allow installation of noise and screen walls between traffic and homes.
Main Roads will build the walls along the eastern side of the freeway, which will have anti-graffiti paint and panel colours in olive green tones.
The concrete and steel structures will be at least 1.8m high and are designed to reduce the impact of noise levels predicted on the freeway up to 2040.
Earthworks have also started at Hutton Street for the cyclist underpasses being created as part of a principal shared path connection between Hutton and Glendalough Station.
The Hutton Street on and off-ramps will be replaced with temporary ramps, with freeway access at Hector and McDonald streets closed and road users detoured to Cape Street.
The Hutton off-ramp will be reduced to one lane on Saturday, May 18 and 25, from 10am to 7pm.