[talk-au] traffic lights on dual carriageway intersections

Ross Scanlon info at 4x4falcon.com
Sat Nov 3 08:21:54 GMT 2012

And the only area it's done like this is in Melbourne.


On 03/11/12 17:03, John Henderson wrote:
> "Steer" wrote:
>> I have been trying to find the accepted practise for mapping traffic
>> lights where dual carriageways interest. There is much discussion
>> on various sites, but most seems to be a bit old, and I’m not
>> convinced I’ve found what is the latest accepted practise.
>> I checked some intersections in Melbourne’s CBD, and the method I saw
>> that I liked and thought the best was where there were 4 lights at
>> the intersection, but they were not placed on the intersecting modes,
>> but one node back “upstream” on each way. I think this is good
>> because no matter which way you go through the intersection, you only
>> pass one set of lights (rather than 2 if they were placed on the
>> actual intersecting nodes).
>> Any comments?
> I have always entered such traffic lights on dual carriageways in the
> way you describe. This is because:
> 1. The "traffic light count" along a section of road is then accurate, and
> 2. It's the accurate representation of what's on the ground. It lets
> us convey the significance of the stop lines associated with the lights.
> That's something we can't do with two-way traffic without compromising
> point 1.
> I have argued this position on previous occasions.
> John
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