There are anti-skid adhesive strips (for bath tubs?) available at Home Depot (for one) that I used on the tops of the ridges strategically placed where I step all the time. So far it has worked really well, going on two years.

1953 Chevrolet 3600
Fried Green T'mater (Vern)
In the Stovebolt Gallery
Caution: Political Statement
Man who runs in front of car gets tired, man who runs behind car gets exhausted.