Can anyone tell me what the diamond markings on the m6 around Birmingham mean.
I always though it meant keep in lane 1…Could be wrong though! 
if you are on about the one’s approaching j6 (a38) then they are used as a form of lane control for that exit.
Yes they are the ones thanks for that
Only numpties are allowed to cross them, preferably in the pouring rain forcing everyone else to brake and take evasive action so said numpty can get 3 cars in front for their shuffle down the expressway into inner city hell.
maps.google.co.uk/maps?q=birming … 6,1,-8.21
The mark 1 eyeball will give you you’re answer 
Seriously dude wtf 
do you drive with your eyes closed