Alberta Transportation's 46th annual Highway Clean-Up returns Saturday, May 7.

Various community groups get together on the first Saturday in May to pick up trash and other items from the ditches as a way to raise money for their organizations or specific charities.

RCMP are encouraging motorists to use caution while driving on provincial highways as thousands of volunteers participate in the cleanup from 7 a.m. to 5 p.m.

The RCMP asks motorists to slow down in marked cleanup areas and to be aware of the added foot traffic. 

They'll be increasing patrols across provincial highways to enforce traffic safety and prevent speeding in these areas.