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Looks like there are lots of small roads parallel, and I think he must have walked/pushed down the drainage ditch and crossed on this footbridge https://maps.app.goo.gl/UHKGsrt74MuqdGQ57?g_st=ic
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His track doesn't look as if he went north of the road, but it's hard to tell because there are few transmission points--maybe he just went along those field boundaries past the footbridge and then used the various paths and roads between the two motorways? As a mountain biker, he won't have too much of a problem with going off-road for a bit if it means a significant shortcut.
Interesting, looks like Robin is on the E87 now, maybe that bit not banned?
Abdullah looks like he's missed the right turn to head towards Gallipoli on E87. Now heading straight on towards Istanbul. Does he have to turn later to minimise time on the E87...?
I need to have a look at the Google map to see what they are doing!