Forums Forums Traffic Signals Ahead filter arrow

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    Pat Gregory

    This arrangements has been implemented for the new Cycle Superhighway schemes in London (bikes instead of trams) there are some problems with road space and lane discipline, but the arrangements appear to have ‘bedded in’ quite well. Not sure if any of the sites are on ‘earth’ yet.

    Chris Pearson

    Just putting something very similar in place in Blackburn to cater for a generally little-used ped phase across a side road that it wasnt possible to build as a walk-with-traffic.

    The stage arrangement is exactly the same – needless to say the lanterns are quite… large!


    have a look at the junction of Manchester Road with Market Street, Droylsden, Manchester. They have something similar where use ahead filters to protect tram movements. Sorry the Google streetview is a bit poor.


    Thanks Tanya, that’s reassuring.

    Tanya Soar

    Something like this (no trams though)?,-0.5998501,3a,44.7y,202.88h,80.96t/data=!3m6!1e1!3m4!1sLVFt05nxf1OOVnXUxRdIlg!2e0!7i13312!8i6656?hl=en

    Works very well, with good compliance from right-turners.


    In Nottingham we have an existing T-junction which has tram movements entering at the top of the T which has the following stages:

    Stage 1 – main road in both directions
    Stage 2 – main road outbound with RTIGA
    Stage 3 – side road
    Stage 4 – pedestrians along with trams when needed

    When trams are present, because of the alignment, stage 4 and its associated clearance period run for a long time during which the main road outbound is held resulting in congestion. Separately signalling the outbound ahead and right turns so that the ahead movement can run during the tram clearance period has been resisted as fully signalling the right turn would create its own problems.

    It has recently been suggested that we try running the outbound ahead movement with an ahead filter arrow during the tram clearance period. This would leave the right turners held whilst the ahead filter was running, able to accept gaps during the full green and with the RTIGA to help them at busy times.

    Has anybody else used an ahead filter along with an indicative green arrow in this fashion or have any experience of how waiting right turners respond to this signal arrangement? All thoughts welcome. Thanks.

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