I was out and about on the M25 last night. There were umpteen roadworks and speed restrictions. I was coming into a section that had the inside lane closed and the speed limit had been 60, 50 & finally 40. I'm sitting at about 45 when I see a whole lot of traffic coming up behind me at considerably faster than 40. All overtook me but white van man shot up my inside in the closed off lane as though I wasn't moving. I've seen cars rear ended because they were travelling at the speed limit. What speed would you guys do in road works late at night?