Hi Tc,
I'm very familiar with the stretch of road, in fact I use the Shell petrol station on Wick Rd. for my Optimax stuff
It can be chaos when traffic volumes are high, and it usually always is on that stretch of road - the 40mph limit is ridiculous, but well sign posted, with an endless array of GATSO cameras to enforce it
I believe the reason for the 40 limit and tight enforcement was to stop huge volumes of cars piling up at the traffic lights just before the tunnel - which I'll admit was a problem many years ago - and still is, somewhat - but something else has developed over the years, and about 1-2 miles before the tunnel, the far left lane is already sign posted as the A13 exit, but people are using it to sneak ahead and cut back in at the last minute, and because so many people are doing it, if you wanted to abandon your tunnel route and detour on the A13, you simply can't because the plonkers have blocked it up.
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Incidentally, the reason I don't use that road and use A406/A13 instead is because it is almost impossible to actually get onto the A12 from the A406. Now the 40mph speed limit on the A13 IS too slow, albeit that I can see a rationale on one stretch of the road, between the A406 and A117 junctions which are very close together
That's the Red bridge roundabout your referring to? That is pure lunacy, the words 'lane discipline' loses all meaning

I witnessed a poor fella waiting at the lights in his Clio get rear-ended by a flatbed truck who didn't see the light was red, and i've come close to doing that too, because your eyes are looking down at the tarmac to find the lanes.
I use the A13 to go visit my brother in basildon, but started using the A12/A127 because twice in quick succession, they've closed flyovers on the A13