Around schools in the UK, the speed limit is often 20mph instead of 30mph. Now that makes sense, if there's kids running around, driving at 20 instead of 30 would be safer. If it's 3am, there won't be many kids about, but the limit stays the same.
What I think we could benefit from would be variable speed limits in the UK.
And so there's no arguing about what counts as a 'wet road', we could use electronic signs that are changed remotely due to time of day and weather conditions.
James Richards, ADI