1st R'bout on the A31 to get shell gripped was incidently the Dorset police HQ one! Odd that? Though they didn't do it right and the surface did not stick so it was like riding on millions of little ballbearings! 2 bike cops binned it and a few cars lost it big style. Now it's all sorted it's so grippy that it tears chunks out of my tyres but I sure wouldn't like to get my knee or any other part of me down on it coz it would rip me to shreds! They have done most of the r'bouts on the A31 between Ringwood and Merly now and it's great but I've found one thing with shell grip. Diesel - it doesn't disperse but sits in the surface so as long as it not too thickly spread you get the grip on the r'bout then hope you can get it upright before you exit!