Travelled down from my Mum's yesterday, my missus counted over 30 speed cameras on our side of the road down the north section of the motorway around Solihull. It always seems to have a 50mph limit. One of the worst roads in the country IMO. Why is it like this? We also noticed single lines and further down the motorways two dots together, followed by the same thing a bit down the road. What are these? Different types of speed camera?