Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on [email protected] for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact [email protected]

M50 - Speed Limit

  • 14-02-2012 10:29am
    #1
    Registered Users Posts: 9,955 ✭✭✭


    I was in Dublin recently, and it was only the 2nd time I was driving myself on the M50, and I was wondering - why is the speed limit at 100? I would have thought all motorways are at 120??


Comments

  • Registered Users Posts: 12,699 ✭✭✭✭flazio


    The lanes are narrower and the traffic intensity is higher then perhaps any road in Ireland. 100km/h is the safest speed to deal with these factors.


  • Registered Users Posts: 781 ✭✭✭mydiscworld


    Too many junctions and idiot drivers. It would be too dangerous tbh.

    A national audit of all speed limits has been announced but I'd doubt the M50 would be upgraded to 120.


  • Registered Users Posts: 9,955 ✭✭✭dulpit


    Huh, fairy nuf.

    Suppose as it was a Saturday that I was driving on the road, traffic was pretty light, but I'd imagine it must be hectic in rush hour...


  • Registered Users Posts: 2,014 ✭✭✭niloc1951


    dulpit wrote: »
    Huh, fairy nuf.

    Suppose as it was a Saturday that I was driving on the road, traffic was pretty light, but I'd imagine it must be hectic in rush hour...

    This System could be used with for example 90KPH during busy times or when weather conditions are bad and 120KPH when traffic is light and weather conditions are good.


  • Closed Accounts Posts: 3,340 ✭✭✭Please Kill Me


    I heard it was to keep noise levels down, as the residents in the surrounding estates were complaining?? :confused:


  • Advertisement
  • Registered Users Posts: 7,786 ✭✭✭munchkin_utd


    niloc1951 wrote: »
    This System could be used with for example 90KPH during busy times or when weather conditions are bad and 120KPH when traffic is light and weather conditions are good.
    they are installing that at the moment on the overhead gantries


  • Registered Users Posts: 123 ✭✭brandodub


    Narrower lanes and reduced sightlines I think is the official reason.


  • Registered Users Posts: 14,015 ✭✭✭✭Mc Love


    The question is does anyone do 100km/h on the M50??

    Also people dont seem to travel at 100km/h on the three lane part of the N7


  • Moderators, Business & Finance Moderators, Motoring & Transport Moderators, Society & Culture Moderators Posts: 66,584 Mod ✭✭✭✭L1011


    Mc Love wrote: »
    The question is does anyone do 100km/h on the M50??

    Also people dont seem to travel at 100km/h on the three lane part of the N7

    I often find that doing an actual 100km/h (GPS not indicated - cars over-read almost across the board) on either road has you going faster than most traffic, when the road is busy

    When its not busy, try 130+ for the N7 anyway.


  • Registered Users Posts: 6,106 ✭✭✭antoobrien


    MYOB wrote: »
    When its not busy, try 130+ for the N7 anyway.

    It's 30km over the speed limit and the traffic corps seem to love that road (don't go out there often but any time i'm on it I see at least one car).


  • Advertisement
  • Moderators, Business & Finance Moderators, Motoring & Transport Moderators, Society & Culture Moderators Posts: 66,584 Mod ✭✭✭✭L1011


    antoobrien wrote: »
    It's 30km over the speed limit and the traffic corps seem to love that road (don't go out there often but any time i'm on it I see at least one car).

    Its what the running speed seems to be at quiet periods.

    Work on the N7 and its (surreally, as I live on the M4) easily the easiest way home and I haven't seen a single TC car doing checks in five years. Seen a few camera vans at Rathcoole inbound though.


  • Registered Users Posts: 68,317 ✭✭✭✭seamus


    Reduced sightlines and more bends was the official excuse for the southern section of the M50.

    Narrower lanes is the official excuse for the updated M50.

    This is of course complete nonsense. The lanes on the M50 are now at the standard Irish width of 3.5m, which doesn't appear to pose an issue for 120km/h speed limits on other new Irish motorways.

    It was reduced from the UK standard of 3.75m (12 feet) when the third lane was put in, and somebody decided this was a good reason to reduce the limit to 100km/h.

    Clearly nobody informed them that some sections of the German autobahn with no effective speed limit, also have 3.5m lane widths.


  • Moderators, Business & Finance Moderators, Motoring & Transport Moderators, Society & Culture Moderators Posts: 66,584 Mod ✭✭✭✭L1011


    seamus wrote: »
    Reduced sightlines and more bends was the official excuse for the southern section of the M50.

    Was noise, actually. Its a planning constraint - can't exceed 100 on the existing planning permission


  • Registered Users Posts: 6,106 ✭✭✭antoobrien


    MYOB wrote: »
    Was noise, actually. Its a planning constraint - can't exceed 100 on the existing planning permission

    i think there was also something about the distance between the junctions not being enough to justify 120km/h as well.


  • Moderators, Business & Finance Moderators, Motoring & Transport Moderators, Society & Culture Moderators Posts: 66,584 Mod ✭✭✭✭L1011


    antoobrien wrote: »
    i think there was also something about the distance between the junctions not being enough to justify 120km/h as well.

    This is just the southern cross section in question - the distances between the junctions there are huge!


  • Moderators, Technology & Internet Moderators Posts: 11,410 Mod ✭✭✭✭icdg


    MYOB wrote: »
    This is just the southern cross section in question - the distances between the junctions there are huge!

    The speed limit on the Southern Cross was 60mph on the day it opened, so it must have been a planning permission thing.

    OP the 120 km/h limit for motorways is just a default, not a requirement. Road authorities are free to set special speed limits on motorways just as on any other road.


  • Moderators, Business & Finance Moderators, Motoring & Transport Moderators, Society & Culture Moderators Posts: 66,584 Mod ✭✭✭✭L1011


    icdg wrote: »
    The speed limit on the Southern Cross was 60mph on the day it opened, so it must have been a planning permission thing.

    It was - noise concerns as I mentioned.


  • Registered Users Posts: 1,004 ✭✭✭Brian CivilEng


    If you travel the whole length of the M50 you'd take 4mins longer travelling at 100km/h than at 120km/h. Hardly a big issue, but time savings of 4mins have been used to justify spending millions on other schemes.

    I worked on the M50, and at the time one of the reasons given for the lower speed limit was higher capacity. Traffic can travel closer together at 100 than at 120, so more vehicles can physically fit on the road. In addition to the narrower lanes, noise and junction spacings I don't think that 100km/h is a bad compromise.


  • Closed Accounts Posts: 347 ✭✭quietriot


    It might be 100kph but I can't remember ever having done 100kph on it.


Advertisement