I have had a similar problem for years. The straight part of my wall continues round as a bend into a turning area and they hit that bend bit when turning. My wall is only about 2 feet high.

The low height of a wall means they can't see it when they reverse. Thus if yours/mine were taller, it would be less likely to be hit. I am not convinced it would be a total solution in my case. So I am not re-building until all the curved section has gone. In any case, any new wall would need to be built in separate sections so as to minimise the damage caused by a single hit.

Years ago I talked to the local roads authority and managed to get the silly one slab wide pavement (just the straight bit, in the turning area) extended out a bit after a lot of effort that eventually had to hint at legal action. At least that wall is still up after 20 years.

Also considered (but not for long) was putting round bollards to protect my curved part. Then they said, "Oh, if they are knocking your wall down, they will knock our posts down so we won't do that" -- surely that's what they are there for?

I now no longer have the damage section rebuilt. They are slowly demolishing it, brick by brick, but at least I get several years.

If you build brick posts they need to be at the very least 18 inches square, go in deep, and have their hollow centres filled up with good concrete.