How many tyres??

I travel to Boston daily for work along the A17. I live in Sleaford but I also collect my son from Fulbeck daily travelling the A17 from Holdingham towards Newark and back to Sleaford. There are a number of large potholes that have been repaired and deteriorated once again that are near Cranwell airfield and the speed camera. They are on either side of the road and one in particular is a jagged long pothole in the middle of the road, if not careful you hit it when heading east.

I have paid out for the same tyre on my car to be replaced twice in 3 months and we have just had a flat tyre on our other car that upon inspection, the car needed a further two new tyres. What do I pay Road tax for?!