[TCUG] Re: Loops and ASL's - an open question!

I have designed and installed many installations with ASL's and D' loops.  =
I have always located the loops at standard spacings from the vehicle =
stopline and not the advanced stop line.  My thinking behind this is that =
it is no different to any vehicle stop line.  All intergreens etc. are =
measured from the vehicle stop lines and vehicle extensions on the loops =
are not normally affected.

To reinforce this argument on one of our sites with ASL's and D' loops we =
have red light cameras installed.  The cameras loops are installed and =
configured around the vehicle stopline as this is the requirement set out =
by our local police authority..

Regards

Andy Sawyer - Sefton M.B.C

>>> Howard.Saffer@xxxxxxxxxxxxxxxx 19 September 2001 15:38:18 >>>

Now there are some users enrolled out there - (and you're all probably fed =
up already with replies to Peter Bull from other users joining) - an open =
question - to get the ball rolling!

Recently we have mainly been installing MVDs with stopline loops on most =
of our schemes.

On a current scheme we want to install an advanced (cycle) stopline (ASL) =
- but need system D loops (in association with speed discrimination).

Do (you) other users set out your system 'D' loops 12, 25 and 39 metres =
from the vehicle stopline - or from the ASL? What is your rationale for =
whatever you do on this?


Howard Saffer
Traffic Signal Design
Sheffield City Council
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