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M1 New Section of D3 (three lanes) at Swords

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  • Registered Users Posts: 78,400 ✭✭✭✭Victor




  • Registered Users Posts: 68,786 ✭✭✭✭L1011


    Is that not just legally stating the status quo we have on-ground with the current signage?


  • Registered Users Posts: 78,400 ✭✭✭✭Victor


    Quite possibly. Current legal limit is 50km/h at Swords.


  • Registered Users Posts: 9,233 ✭✭✭sdanseo


    MYOB wrote: »
    Is that not just legally stating the status quo we have on-ground with the current signage?

    No, still 80km/h between J1 and J2 on the M1. Being honest, I think there should be lane-specific limits here (actually, on the M1N the lanes are actually signposted different limits, with temporary signs, the legality of which would have to be questioned.)

    J1-J2 M1N - Lane 1/2/3 (R132/R132/M1N) should be 80km/h, slowing to 60km/h the usual distance from the tight curve.
    Lane 3 here should be slower because it's a lane gain and thus has a huge amount of merging in both directions passing through it.
    J1-J2 M1N - Lane 4/5 (M1N) 100km/h

    J2-J1 M1S - Lane 1/2/3 (M50S/M50S/R139) - 80km/h
    Lane 3 this side - once again a lot of merging between Lanes 1-3, so 80km/h.
    J2-J1 M1S - Lane 4/5 (M50N) 100km/h all the way to the tunnel entrance.


  • Registered Users Posts: 8,779 ✭✭✭Carawaystick


    sdeire wrote: »
    J2-J1 M1S - Lane 4/5 (M50N) 100km/h all the way to the tunnel entrance.

    ^^
    This says a lot about Irish infrastructure.
    A road heading south being labelled N



    Am I right in thinking the maps they use
    have seen better days... The M50 passes nowhere near Coolock, but does go by Coolock lane in Santry...


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  • Registered Users Posts: 78,400 ✭✭✭✭Victor


    This is approximately what they are proposing, when you add in the adjacent speed limits.

    I think some of the jumps from 50-100km/h or 60-120km/h or 50-120km/h at Swords and vice versa are excessive and will lead to excessive acceleration and/or braking, with everyone racing down the on-ramp only to realise there is nowhere to go.
    sdeire wrote: »
    No, still 80km/h between J1 and J2 on the M1. Being honest, I think there should be lane-specific limits here (actually, on the M1N the lanes are actually signposted different limits, with temporary signs, the legality of which would have to be questioned.)
    I think there is too much movement between lanes for there to be variable speed limits in this area.

    South of the Airport interchange, it should all be 80km/h, not least for tunnel traffic management.
    Am I right in thinking the maps they use have seen better days... The M50 passes nowhere near Coolock, but does go by Coolock lane in Santry...
    That is the engineers, not the map.


  • Registered Users Posts: 78,400 ✭✭✭✭Victor


    One option to get rid of a chunk of the weaving traffic would be to add a slip road (marked orange in the attached) from the M50 eastbound to the M1 northbound, merging on the 'wrong' side of the M1 - potentially one would restrict this to cars only.


  • Registered Users Posts: 9,233 ✭✭✭sdanseo


    Victor wrote: »
    South of the Airport interchange, it should all be 80km/h, not least for tunnel traffic management.

    Still think this depends on the lane, and more importantly the time of day. I try sticking to 80km/h on the M1 south of J3 at night and it's really hard to do.

    Even during the day, 100km/h from the tunnel onwards northbound should be safe. Fewer lane changes in the running lanes, as there's an auxillary lane there.


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