Hi, well it does state on the pack 'Off-road or interior use only". Perhaps the * links to another statement on the pack? In the UK we aren't allowed to have anything on the front of the car that has a blue tint as our emergency services have blue lights. I think yellow would also be a MOT failure as well because that is a colour only for the indicators.
Mk3 Focus Titanium X, 1.6 Ecoboost 150ps + Bluefin Remap
18" 5 Spoke Alloy Wheels
Manual 6-speed gearbox,,,