In message , at 13:59:13 on
Sat, 7 May 2011, Basil Jet remarked:

I thought driving with sidelights was legal if the road has
streetlamps, which many motorways do.

I'd be a bit careful about mapping rules from normal roads to motorways.

Motorways with streetlamps don't have an implied 30mph speed limit, nor
do they have "National Speed limit" repeaters on those streetlamps.
--
Roland Perry