"Roger Mills" wrote in message
...
M1 from M18 to Ferrybridge (start of 3-lane motorway rather than 2-lane
dual-carriageway) is bad too at times.

That's such a short section (~ 1 mile?) that it doesn't really make any
difference.

No, check a map. It's about 18 miles. Although *some* of the intervening
section is A1(M), which I'd forgotten about, it's still (I'm sure) only 2
lanes.