Cycling on footpaths was made legal in WA last week and the government agreed to increase the number of dedicated bike paths after two cyclists were hit and killed by cars in Perth on the same day last month.
Previously only children under 12 were allowed to ride on footpaths but the new rules apply to all cyclists.
All other states now allow adults to ride on footpaths except Victoria and New South Wales, which restrict the right to children under 12 and accompanying adults.
Transport Minister Dean Nalder said the Cycling and Pedestrian Advisory Group found allowing cyclists of all ages on footpaths had safety benefits and very low risks to pedestrians.
But Greens MLC and transport spokesperson Lynn MacLaren criticised the move."Bike riders who opt to ride on footpaths under a relaxing of the rules by the Barnett Government must take extreme care around vulnerable pedestrians," she said.
"Bike riders should be able to occasionally use the footpath because our roads are still largely configured with just cars in mind – however it is not an ideal situation and what we urgently need are more cycle lanes and paths."