http://maps.live.com/default.aspx?v=...3892&encType=1
shows the new layout of the junction where Tunnel Avenue and Blackwall Lane
meet the A102.

http://maps.live.com/default.aspx?v=...2905&encType=1
shows the old layout.

The main change seems to be that previously you could turn right off the
northbound offslip and then turn left onto the northbound onslip (should you
so wish), whereas now the traffic turning right from the offslip is forced
into a segregated lane between the two carriageways which takes it past the
onslip without allowing access to it. The only reason I can think of for the
change is that they want to stop traffic from avoiding jams on the flyover
by coming though the junction... but since you can drive across into Tunnel
Avenue and do a comfortable leisurely U-turn back to the junction, only
losing a few seconds in the process, the change seems fairly pointless... I
saw some dangerous driver confusion while I was there, and the "No Entry"
text on the tarmac seems like an admission by the engineers that they have
created something baffling and dangerous.