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Bodkin / Headford Road roundabout replacement [Lights are on!]
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galwaycyclist wrote: »This exit is frankly dangerous and needs to be redesigned. If you look at the path taken by the straight on cyclists - yellow arrow - they are exposed to weaving traffic crossing them from both the left and the right - blue arrows.
The left slip needs to be shortened considerably or removed. Likewise the sweeping curve into the shopping centre is dangerous and needs to be tightened up into a proper 90 degree turn with a tight corner. Other wise omit this entrance altogether.
Looking at the plans linked by Antoobrien from the tender documents it seems this junction is now to be slightly less offensive.0 -
There is another problematic aspect with the current design which is the use of slip roads.
To go back to first principles, one of the reasons for removing the roundabouts is because the design used in Galway is hostile for cyclists, motorcyclists and pedestrians. The reason why the roundabouts historically favoured by Galway City Council are so hostile is because they are effectively set out as a series of slip roads with traffic entering and a leaving at a shallow angle rather than making 90 degree turns. This encourages higher turning speeds and creates a situation where cyclists and motor cyclists are at particular risk from cars or other vehicles that fail to yield.
The scenario highlighted in the red circle here illustrates the problem.
So in effect a main reason for removing Irish roundabouts is to get rid of slip roads. The issue of slip roads is acknowledged in the recently published Design Manual for Urban Roads and Streets
http://www.environ.ie/en/Publications/DevelopmentandHousing/Planning/FileDownLoad,32669,en.pdf
(File is about 5Mb)
Page 104Omit left turn slips, which generally provide little extra effective vehicular capacity but are highly disruptive for pedestrians and cyclists. Where demand warrants, they may be replaced with left turning lanes with tighter corner radii (see Figure 4.59).Figure 4.59: Left turning slips (left) generally offer little benefit in terms of junction capacity and increase the number of crossings pedestrians must navigate. They also allow vehicles to take corners at higher speeds, exposing pedestrians and cyclists to greater danger. Where a large number of turning movements occur, left turning lanes (right) with tighter corner radii should be used.
In the Bodkin redesign, the city council are partially replacing problematic slip roads with more slip roads.
In this screen grab we can see slip roads at the Sean Mulvoy outbound and going from the Bridge onto the Headford road outbound. (Tender file 60051475_N6-141.7_T_B.pdf)
There is also to be a slip road arrangement at the new junction with Dun Na Coiribe (Tender file 60051475_N6-141.7_T_B.pdf)
Of these, the slips at Sean Mulvoy Road and Dun Na Coiribe are the most problematic as these are "yield" based. The cycle lanes will be keeping cyclists in to the left where they are outside the "zone of observation" of entering motorists - who will be effectively trying to look backwards.
The slip going onto the Headford Road from the bridge should be better because it is traffic light controlled. However it will depend on the sequence of the lights and the assumed speed of crossing traffic. If there is a chance that a cyclist could still be passing through the junction when the lights for the slip change to green then there is a problem. Hopefully the pedestrian crossing catches this.0 -
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galwaycyclist wrote: »There is another problematic aspect with the current design which is the use of slip roads.
To go back to first principles, one of the reasons for removing the roundabouts is because the design used in Galway is hostile for cyclists, motorcyclists and pedestrians. The reason why the roundabouts historically favoured by Galway City Council are so hostile is because they are effectively set out as a series of slip roads with traffic entering and a leaving at a shallow angle rather than making 90 degree turns. This encourages higher turning speeds and creates a situation where cyclists and motor cyclists are at particular risk from cars or other vehicles that fail to yield.
The scenario highlighted in the red circle here illustrates the problem.
So in effect a main reason for removing Irish roundabouts is to get rid of slip roads. The issue of slip roads is acknowledged in the recently published Design Manual for Urban Roads and Streets
http://www.environ.ie/en/Publications/DevelopmentandHousing/Planning/FileDownLoad,32669,en.pdf
(File is about 5Mb)
Page 104
In the Bodkin redesign, the city council are partially replacing problematic slip roads with more slip roads.
In this screen grab we can see slip roads at the Sean Mulvoy outbound and going from the Bridge onto the Headford road outbound. (Tender file 60051475_N6-141.7_T_B.pdf)
There is also to be a slip road arrangement at the new junction with Dun Na Coiribe (Tender file 60051475_N6-141.7_T_B.pdf)
Of these, the slips at Sean Mulvoy Road and Dun Na Coiribe are the most problematic as these are "yield" based. The cycle lanes will be keeping cyclists in to the left where they are outside the "zone of observation" of entering motorists - who will be effectively trying to look backwards.
The slip going onto the Headford Road from the bridge should be better because it is traffic light controlled. However it will depend on the sequence of the lights and the assumed speed of crossing traffic. If there is a chance that a cyclist could still be passing through the junction when the lights for the slip change to green then there is a problem. Hopefully the pedestrian crossing catches this.
I know the slip lane coming over the Q Bridge won't be a yield, it will be controlled by lights, similar to the left slip lanes at Moneenageisha on Dublin Rd & Monivea Rd, will have to check on the other 2, think they might have been revised too... Also the entrance/exit to Galway Shopping Centre off Sean Mulvoy RD is now only a temp road in a temp position0 -
ballinadog wrote: »Also the entrance/exit to Galway Shopping Centre off Sean Mulvoy RD is now only a temp road in a temp position
What exactly does this mean?
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Might need a thread of it' own. Just spotted this via twitter.As its a stone's throw from the Bodkin Junction have posted here.
http://www.galwaycity.ie/GeneralNews/290813_02.html
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Public Notice: Bóthar na dTreabh (N6) Multi-Modal Corridor Improvement Scheme - Terryland Retail Park Access Junction Upgrade
29 August 2013
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They are slowly creeping down to the Menlo Park Hotel Roundabout(Kirwin)
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This discussion has been closed.
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