Sight lines

Slates

I need a bit of advice please, What are the limits for sight lines on a private lane which ends in a House/farm yard (50m away form entrance), the other end of the lane is a T-juction onto another laneway (40m away)the joins onto a regional road. I will be able to see both the House and T-juction where I hope to put my entrance, but will I have to alter the T-Juction as the visability on the second laneway on the right is no more then 20m ?

muffler

If its a lane > lane only then I cant see the planners having a problem with it. However its where the lane exits to the public road would be the issue.

Slates

I was talking to both the planners and road authority of the local council and have it sorted, as the lane is private there is no need for the NRA sight lines on it, but the junction of the Local Tertiary road and the lane will need the required sight lines,which it has

Slates

Does anyone know what the permissible height of a hedgerow is to allow sight lines to be seen over it ?

Thanks in advance....

Jollyman

Slates wrote: »

Does anyone know what the permissible height of a hedgerow is to allow sight lines to be seen over it ?

Thanks in advance....

We had to remove ours completely, grade it back from level with the road. So you can see clearly when you are sitting in a car.

smashey

Slates wrote: »

Does anyone know what the permissible height of a hedgerow is to allow sight lines to be seen over it ?

Thanks in advance....

Well considering the view point is at a height of 1.05 metres, then it should be cut so that it doesn't interfere with the vision lines.

Slates

smashey wrote: »

Well considering the view point is at a height of 1.05 metres, then it should be cut so that it doesn't interfere with the vision lines.

So on a Local Tertiary road I will need a sight line of 60m at a height on 1.05m

muffler

Slates wrote: »

So on a Local Tertiary road I will need a sight line of 60m at a height on 1.05m

In short yes but do check that the 60m is correct and also note that in some instances the PA may look for the removal of the hedge completely but it varies from county to county.

SPM

and also if i'm n ot mistaken, the 60m has to be 2m in from the edge of the road; where your boundary meets the road.

Schooby

the standards can vary slightly between different councils and the design manual for roads and bridges DMRB by the DOE, this is the master document for all these issues in Ireland. the heights as far as I can recall are from 1.15m above ground to a point at 1.05m above ground level at the required distance be it 60, 90, 120m depending on deisgn and use speeds of hte road onto which the access is to be constructed.

the prescribed set back distance from the "metaled" edge of the road ie edge of the tarmac is 3m.

there is provision to vary from the prescribed standards, the basic idea is will it be a safe entrance for traffic leaving and entering the new entrance and that is what anyone assesing is will asses it on.

Mellor

SPM wrote: »

and also if i'm n ot mistaken, the 60m has to be 2m in from the edge of the road; where your boundary meets the road.

The 60m is measured along the road, the point where the sightline starts is back from the road. You said 2m, Schooby says 3m.
I thought the general one was 2.5m or there abouts.
Of course all of these can change subject to PA or LA standards. Alot of counties will accept a set back of 1.2m (not at road junctions) where the the junction is unlikely to be used by more than a single car at a time.

godtabh

For non national roads check out the Manual for Street 2007. Its very good and has got me out of a few binds lately

Sparky78

kearnsr wrote: »

For non national roads check out the Manual for Street 2007. Its very good and has got me out of a few binds lately

Where would i get a hold of this?
Having difficulties with a condition on my planning permission in relation to sightlines.There looking for 90m on a non national road with a 60kph speed limit!!!
Thanks

Slates

Sparky78 wrote: »

Where would i get a hold of this?
Having difficulties with a condition on my planning permission in relation to sightlines.There looking for 90m on a non national road with a 60kph speed limit!!!
Thanks

Road Speedlimit Designspeed Sightline
Regional 80 85 160
Strategic local primary 80 85 160
Local primary 80 70 120
Local Secondary 80 60 90
Local Tertiary 80 50 60

Taken from the Laois Co Co Roads atandards

muffler

Slates wrote: »

Road Speedlimit Designspeed Sightline
Regional 80 85 160
Strategic local primary 80 85 160
Local primary 80 70 120
Local Secondary 80 60 90
Local Tertiary 80 50 60

Taken from the Laois Co Co Roads atandards

That local primary looks a bit sus.

Slates

muffler wrote: »

That local primary looks a bit sus.

Oops :eek:

muffler

Slates wrote: »

Oops :eek:

Do you want me to edit it - whats the correct figure 120???

godtabh

Sparky78 wrote: »

Where would i get a hold of this?
Having difficulties with a condition on my planning permission in relation to sightlines.There looking for 90m on a non national road with a 60kph speed limit!!!
Thanks

Should be able to get it in a library.

Its probably more suited to built up areas. If you send me you email i'll try and scan the relevant bits.

If you have a good engineer he can make up a good argument as why it would be used.

muffler

Sparky78 wrote: »

Where would i get a hold of this?
Having difficulties with a condition on my planning permission in relation to sightlines.There looking for 90m on a non national road with a 60kph speed limit!!!
Thanks

If kearnsr doesnt get you sorted I have a couple of NRA documents here I can email you.

Sparky78

PM's sent.
Thanks Lads.

Slates

muffler wrote: »

If kearnsr doesnt get you sorted I have a couple of NRA documents here I can email you.

It 120 !

Can you post those NRA documents ?

muffler

Slates wrote: »

It 120 !

Can you post those NRA documents ?

theres 2 docs. in total and the size is too big to post up here. If you want (or anyone else for that matter) to PM your email address I will send them on to you.


Edit: I amended the sight line referred to earlier. I was tempted to put in 1200

godtabh

Ì presume your talking about TD 41/95? The application of that is fairly strict so I wouldnt even mention it to the council if you cant get it to work.

Also the road classifcation is very imporant. Only applies to certain roads,.

Just sent an email to sparky

CamperMan

I am puzzled,

I got a letter from the Leitrim Co Co and they mentioned that I will need to have 130m sightlines??, that seems excessive for a rural road, the road in question is a narrow road off the R209, did the council get this wrong?

muffler

CamperMan wrote: »

I am puzzled,

I got a letter from the Leitrim Co Co and they mentioned that I will need to have 130m sightlines??, that seems excessive for a rural road, the road in question is a narrow road off the R209, did the council get this wrong?

Seems excessive alright. Give the roads section a call.

CamperMan

The roads department sent me this

All developments providing for access onto public
roads must show that the access proposed will not
create a traffic hazard nor interfere with the free flow
of traffic along such roads. Generally site lines
should be in accordance with either Table 4.3 or the
Road Geometry Handbook, published by the
National Roads Authority in December 2000. Each
case will however be assessed on its own merits and
the operational speeds on the roads in question will
also be taken into account.


Road Status 60mph 30/40mph
National Primary
Roads & R280
270m 80m
Other Regional Roads 190m 80m
County Roads 130m 80m
Table 4.3 Sight Lines

These sight distances are measured at a height of
1.05m above ground level from a point 3.0m back
from the edge of the carriageway.

The odd thing is, I have been looking on the planning website at applications than have been approved with only 90m sight lines?

muffler

There is always a minimum and maximum sight line stipulated for the various road classes. In your case its probably a min. of 90 metres. And thats why they say that each case will be assessed on its own merits. Find out which roads engineer is dealing with it and have a word with him.

CamperMan

Thanks Muffler

CamperMan

90 m.... that would be great, the architect came out on Thursday to measure the sight lines, 67m:eek: one way and 76m the other way, seems like we may have to buy a small portion of the neighbours land to allow us to move the proposed entrance further down the road, this would then give us better distances..,

will keep you posted.

muffler

CamperMan wrote: »

90 m.... that would be great, the architect came out on Thursday to measure the sight lines, 67m:eek: one way and 76m the other way, seems like we may have to buy a small portion of the neighbours land to allow us to move the proposed entrance further down the road, this would then give us better distances..,

will keep you posted.

Not sure what the stipulation is for your local authority but you may not need to buy the land unless of course its a big chunk thats needs earthmoving equipment brought in to sort out the sight/vision line.

If its only a hedgerow for example a letter from the owner giving you permission to "achieve and maintain" the vision line would suffice in Donegal.

CamperMan

Hate to sound stupid, but what is a "Local Tertiary Road"??

Thanks

RKQ

Wexford is 65m both directions, set back 2m from iron edge or 3m in the case of cluster development ( 2 or more houses):D

CamperMan

But what about Leitrim?

muffler

CamperMan wrote: »

But what about Leitrim?

You need to check the technical requirements in the County Development Plan

CamperMan

the council requested further information about sight lines, they have asked for 130m...., this is a county road and a single track road at that, it has tight bends and hilly, most people drive on this road at 20mph because its so windy and narrow.... I just hope the architect can talk to the roads engineer and get him to look at the road....

Has anyone experienced this before with the planners where they wanted something like 130m then agreed to go to 80m due to operational speeds on the road?

Camperman