people entering the motorway should adjust there speed,hence why its called a slip road,they slip into an available gap,i drive 100s of miles a day,everyday,my top speed is 56mph,you would be amazed at how may drivers can not join a motorway without causing me to slow down,or if i can move into lane 2 how many drivers then proceed to stay at the same speed as i am doing,leaving me no alternative but to slow down and try to get back into lane 1 which than causes drivers behind me to slow down.if you race down a slip round and i can not slow down or move out of your lane in time then your seriously injured or dead,a 44 ton truck takes some stopping at 56 mph,if they are in front of me as they are about to enter the motorway then i will always reduce my speed a little then flash them to let them join the motorway,if they are doing same speed as me and by the side of my truck then you are in the wrong and should slow down to get on behind me or if possible get up enough speed up to get in front without cutting me up or me smashing into the back