This baffles me too!
So many roads look like patch work quilts! If they just did it properly it would save money and time!!
And the quality of the 'repairs' are shocking! They start cracking up within days too!!
I can't speak for all councils, but ours is shockingly bad. I mean they are really quite terrible.
One thing I have learnt, is that there is no such thing as common sense. There are procedures (which can either be the correct ones, or not), which are then blindly followed without question.
Central government aren't helping, but the blame doesn't always come from them....the local councils are poorly run.
We've had major roadworks in our city for the past five years, which have either made little difference, zero difference, or actually made things worse. The classic, which I'm sure runs across the entire country, is when they improve the roads with the excuse that journey times will be reduced and to ease congestion.....only to then, literally months after completetion, award a builder the contract for 5,000 new homes lol (which they'll then tell BT/Openreach to add capacity for 5,000 new homes (BT will add in capacity for 8,000).......then the builder builds 10,000 homes haha (true story).