Hi Bernhard,
Re your points...
1. There should be no conflicting signals - if there is a traffic light in addition to the stopbar, they should be connected and should always show the same message.
+
2. Why having a traffic light there - colocated with a stopbar? The driver of the non-radio car could also watch the stopbar - could'nt he?
The scenario I was describing was at an airfield without stopbars. This is a common arrangement at UK military airfields.
3. Who wants to have a vehicle without radio cintact on the TWY / RWY?
Not me! But sometimes "MT Routes" cross runways.
See RAF Gibraltar for a lovely example of a dual carriageway, 2 cycle paths, 2 pedestrian walkways and a military MT Route crossing a runway.
4. Furthermore - I would imagine that a traffic light on a pole is quite an obstacle on the edge of a TWY / RWY.
Don't worry
, the type I was referring to in my original post is not on a pole. It's at ground level in a frangible box, well clear of the runway.
Another consideration with this type of system is that often one switch controls lights on both sides of the runway, hence the reason for not always wanting to select the lights to green and letting all the waiting traffic, both sides, cross your runway.
I wish I'd never asked the question in the first place now as it seems the only person who seemed to know what I was talking about was Chilli. I guess I could have gone in to more detail, but I couldn't be arsed really. That'll teach me to be think/type out loud.
Hey, here's an idea! how about a military ATC forum?
Best Regards,
LXGB
