The M1 and the M6 were in a pub when another bit of tarmac came in and ordered a drink.
"Don't look at him" said the M1.
"Why?" said the M6 turning round to look
The M1 grabbed the M6 and said "I mean it - don't look at him"
"OK, OK. I won't. But I don't get it, why?"
"He's a cycle path"
I'll get my coat...