I see the vehicles joining the motorway without consideration of what is already there often. My preferred speed is 58mph, on cruise. I find occasionally I've to pass a wagon in the inside lane so accelerate gently to do it if the middle lane is moving faster. If there are wagons in both inside lanes I speed up even more to pass them where I would be holding up those in the faster outside lane. Then back to the inside lane as soon as. I don't always drop into the inside lane when I can see the traffic in the middle lane is travelling too close to each other to allow me to come out again where I see a possible obstruction ahead, filter lanes, slip roads, and the like. As I also like a buffer zone in front of me to allow for my decelaration instead of braking my holding 58 in the inside lane so driving at a consisitant speed (seems impossible for many) should allow any motorway joiners to adapt and blend. There have been numerous times I've watch as they approach the motorway on their slip road, no indication, no sign that they are adjusting their speed to blend, and a last second adjustment with brakes to avoid collision. They then sem to hold me responsible even though they can't see what I see through my o/s mirror. If I adjust my speed it increases danger as they might also and then we are both slowing until one makes a break for it in the hope the other doesn't also. My holding 58 is the safer option.