Well maybe next time you ought to leave yourself more room and slow down a bit more. I work along the A25 near Sundridge and if you walk along that road you could be blown over as most ignored the 30/40mph speed limits..seriously I did not think it was that bad as I drove past the roadwork twice today!

WHY don't they sweep the road afterwards and recover tons of chippings to re-use ?

They do. But traffic driving over the chippings for a few days is what makes them stick to the road. If they brushed them up the same day, everything would come up leaving a shiny sheet of bitumen.

Does your Polo not have brakes and steering wheel? I hear in the certain combination these two items allow a driver to turn the car round and use a different road if he so desires.

They are doing the roads where I live, and even when I went slowly, I got hit with high speed chips from speeding cars overtaking. There are not many alternative routes, and it is only when you are on the road that you realise how bad it is. If you take a back route, you risk damaging the suspension on rough country roads.