I work in breakdown insurance. I'm concerned about the number of drivers who will be flocking to beaches etc. It only takes one major accident on a motorway and you have thousands of vehicles stuck and at risk of overheating. Then if their cars can't run, air con stops working and you have people stuck in boiling hot cars. If recovery operators can't get to them in a timely fashion, it could be pretty serious for some.
Again, not expecting thousands of such incidents but it's a possibility that drivers need to allow for. Cars should be checked, ice boxes packed with drinks and breakdown insurance documents checked to make sure it's still valid!