30-05-2011, 03:26 PM
(28-05-2011, 07:18 PM)fil Wrote: OK, so the image i had in my mind of a psr was basically a TSR which was a permanent fixture, i.e it had count down markers and commencment board using light weight structured signs like a tsr.
the way i understand the psr now is: any change to the speed profile from the maximum speed.
i didnt realise that the lower speeds (speed boards) were classed as a psr.
this is why i was confused, i couldn't fathom why all of the above you mention was not implemented into a scheme at the design stage and why we continued to use tsr type psr.
although, i do not recall ever seeing a PSR awi while out on track or on a scheme plan.
fil
I suspect you have but didn't recognise for what they were.
See attached a couple of photos- one of a pair of AWI for a differential speed restriction and the other the commencement of a PSR and an AWI warning for a forthcoming even more severe PSR.
PJW