I didn’t say that cars could average 30 on
singletrack road road with blind hills and corners
. I was saying that I don’t think the average would be halved.
And yes I have seen cars doing a ton on roads with limits of 60 and 70 (I have myself). As I have started to cycle on the road more and more I have realised that this is a) stupid and dangerous and b)as a yorkshire man not very good on the wallet. Which would suggest that a complete change in attitude is required.