In reply to Lord of Starkness:
> In Canada during the summer months they go in for 'crack sealing' that involves filling any cracks that have appeared in ht eroad surface over the harsh winters with 'tar' then dusting them with grit.
That used to be done in the UK, and I'd correlated the decline of the practice with the more rapid deterioration of road surfaces and repairs.
I pointed out this observation on UKC a while back, and someone suggested that they're no longer allowed to do this because of H&S risk of having a big pot of hot tar*. Not sure whether it's really an H&S risk, or merely a cost-cutting exercise, but to me, preventive maintenance is probably cheaper that having to repair the entire road surface every few years.
* I'm sure there's a design opportunity here...