incorrect routing into Heathrow T2 & T3

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incorrect routing into Heathrow T2 & T3

Postby MajorJed » Mon Aug 13, 2018 1:02 pm

Please can someone sort out routing issue into Heathrow T2 & T3 as you can not enter into Heathrow via the West Ramp and Tunnel Rd West Roundabout.

I have attached a photo and highlighted the route that has to be taken.

Many thanks
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Heathrow T2 - T3.jpg
Incorrect Routing into Heathrow T2 & T3
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Re: incorrect routing into Heathrow T2 & T3

Postby Twister-UK » Tue Aug 14, 2018 11:34 pm

Heading down the West Ramp and round the roundabout has always been a valid alternative to the route you describe here for accessing the central terminal area from the western side of the tunnel, so is the West Ramp or the tunnel access off the roundabout currently closed off, or is there some other reason why this is no longer a viable route?
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Re: incorrect routing into Heathrow T2 & T3

Postby MajorJed » Wed Aug 15, 2018 11:41 am

As far as I am aware you are not allowed to go around the roundabout to access Heathrow Terminal 2 & 3 it is only for accessing the A4 according to the road signs and the way the layout with the hatched lines at the lights and the fact that in the road it says AHEAD ONLY on the roundabout. Correct me if I am wrong.
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Re: incorrect routing into Heathrow T2 & T3

Postby Twister-UK » Wed Aug 15, 2018 12:50 pm

That's a fair comment, and looking through some of the historical Street View imagery here it does seem as if, for a period in 2014 at least where the traffic lights also had "ahead only" arrows on them, this was the intention - when it's just the rather worn road markings trying to indicate this instruction, it's less obvious that there's an instruction needing to be followed at all...

As it now therefore seems like this route is more of a "backdoor" way to get into the central area rather than an officially approved one, and given that all the traffic signage here does direct drivers towards the east ramp instead, I've now adjusted the map data to prevent this route being suggested in future.
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Re: incorrect routing into Heathrow T2 & T3

Postby MajorJed » Wed Aug 15, 2018 4:44 pm

Thank you, as it is quite confusing when people don't look at the road signs and are only guided by using waze or any other satellite navigation as to using the wrong route and then realising that the priority is only for A4 and not Heathrow T2 & T3.
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Re: Incorrect routing into Heathrow T2 & T3

Postby MajorJed » Thu May 23, 2019 2:50 pm

This has reappeared again and the routing is wrong please look at the attached photo for the correct routing into Heathrow T2 & T3.
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Heathrow T2 - T3.jpg
Correct Route Into Heathrow T2 & T3
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Re: incorrect routing into Heathrow T2 & T3

Postby jonv-uk » Fri May 24, 2019 1:28 am

The edit history for the northern curve shows that the turn restriction, onto Tunnel Rd E was removed 3 weeks ago. This would explain why Waze has started giving this route again.
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Re: incorrect routing into Heathrow T2 & T3

Postby Twister-UK » Fri May 24, 2019 9:14 am

Yes, and the adjacent map comment was also updated with an explanation why the editor responsible decided to make the change - they felt that (unless the white line painting and roadsign erecting gnomes have been out very recently) as there's now no legally binding markings/signage visible here to enforce the older "ahead only" restriction, the right turn back towards Heathrow ought to be permitted in Waze again.

This is becoming something of a grey area argument, as if there genuinely is no legal or physical restriction on being able to follow a given route through a junction, then by default the route should then be enabled in Waze unless there's some other good reason to restrict it. Historically, even after the legally binding signage had been removed from this junction, the way the lane markings were arranged did still strongly encourage traffic to head straight across onto the nearside lanes of the "not-a-bout" from where it would then be difficult to swing back over to the outside lanes required to avoid exiting on the A4 slip, so continuing to restrict the turn made more sense than not.

Given the ongoing lack of maintenance to these markings however, I'm not sure this is the case any more, and having the right turn enabled again feels more appropriate.

I might have a drive down there this evening and get an up to date first hand feel for how the junction appears to drivers just in case there is still something about it that could make doing a right turn here feel odd.
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Re: incorrect routing into Heathrow T2 & T3

Postby jonv-uk » Fri May 24, 2019 4:37 pm

Even though you can 'legally' make this right turn Heathrow must have a reason for not signposting this route into the terminals, possibly for traffic flow. It would only take 5 or 6 cars to start causing an obstruction across Tunnel Rd W and the route onto the M4, whereas the route via East Ramp can accommodate significantly more queuing cars.
As Waze seems to prefer this alternate route, over the sign posted one, the only option may be to leave the turn banned unless waze can be 'taught' the correct way?

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Re: incorrect routing into Heathrow T2 & T3

Postby Twister-UK » Fri May 24, 2019 8:46 pm

Having now driven the route down the west ramp, I'd suggest the reason why we should still prevent Waze offering this as a route into the central terminal area is that trying to cross over from the nearside lane 1 to the offside lane 4 in just a few car lengths, whilst lanes 2 and 3 are quite heavily populated with taxis whisking their latest fares away from the airport, is an exercise in insanity best left to the type of driver happy to just blindly veer across into the next lane and trust the other drivers to do what's needed to avoid a collision...

So I think.the solution here isn't to ban the right turn from the cut through as in the earlier "fix" here, but rather to adjust the mapping of the west ramp merge with the not-a-bout so that we can mark the turn from the ramp onto the cut through either as difficult or simply as prohibited - this would stop Waze trying to route into the central area via the west ramp without the need to.restrict the right turn again.
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