Why no bus lane at Island Bridge?

kida · 17-12-2007 12:28pm #1

Crazy situation
Theres bus lane the whole way from M50 roundabout to Islandbridge - queue for 10/15 mins - then a bus lane whole way up the quays

why not make the bus lane through the junction?

trellheim · 17-12-2007 12:57pm

No bus lanes go through intersections.

Is it St John's Rd you are talking about ?

kida · 17-12-2007 1:36pm

trellheim wrote: »

No bus lanes go through intersections.

Is it St John's Rd you are talking about ?

thats the place - Islandbridge Johns Road intersection.

Mostly bus lanes change to only allow left turns. This changes to a straight on for a few metres for litlte benefit of the car traffic

Here you could easily have the following
The left lane a bus lane - currently it is a straight on and the merges back into bus lane past the junction
Middle lane straight on
Right lane for right turns

murphaph · 17-12-2007 1:46pm

trellheim wrote: »

No bus lanes go through intersections.

Yes they do! That's how all bus lanes should be too!

trellheim · 17-12-2007 5:29pm

for example ?

Bus lanes are ONLY delineated by signs and lane markings. You need both to make it a bus lane.

Can you give me an example where a bus lane is marked and signed across a major intersection / roundabout [ I'd be intrigued ? ] because it'd be illegal to cross it in the crossing junction

murphaph · 17-12-2007 6:02pm

trellheim wrote: »

for example ?

Bus lanes are ONLY delineated by signs and lane markings. You need both to make it a bus lane.

Can you give me an example where a bus lane is marked and signed across a major intersection / roundabout [ I'd be intrigued ? ] because it'd be illegal to cross it in the crossing junction

There are a few examples around Dublin where bus lanes pass left of an island at a T-junction, thereby eliminating the need for the buses to stop even when traffic emerges from the side road on a green signal. Examples can be found at the R835/R136 junction in Lucan, along the Nangor Road at the Killeen Road junction and in a handful of other places.

Edit: Here's the Lucan example. The bus can pass through the intersection on the left uninterupted even when other traffic is halted;

kida · 17-12-2007 6:24pm

trellheim stop being pedantic - you know exactly what I was getting at - the junction I am talking about the bus lanes stops and the bus joins main traffic and queues with all traffic before entering a bus lane again -

Its not the same scenario yo uare talking about - where the bus lane stops and allows left hand truning traffic enter it before becoming a bus lane at the other side again.

trellheim · 17-12-2007 7:33pm

not being pedantic to you kida.

just interested. the 2 inbound RHS lanes get full with traffic spinning the 180 to get to Kilmainham.

The left hand lane needs to be kept free for traffic progressing.. but yes it's only 100m - interesting point - yep it probably should have new lines on it...

murphaph · 17-12-2007 8:34pm

trellheim wrote: »

for example ?

Bus lanes are ONLY delineated by signs and lane markings. You need both to make it a bus lane.

Can you give me an example where a bus lane is marked and signed across a major intersection / roundabout [ I'd be intrigued ? ] because it'd be illegal to cross it in the crossing junction

You're welcome trellheim. :rolleyes:

trellheim · 17-12-2007 10:15pm

Murphaph - yes -good pic that's a rarity

kida · 18-12-2007 9:40am

trellheim wrote: »

not being pedantic to you kida.

just interested. the 2 inbound RHS lanes get full with traffic spinning the 180 to get to Kilmainham.

The left hand lane needs to be kept free for traffic progressing.. but yes it's only 100m - interesting point - yep it probably should have new lines on it...

I stand corrected but I thought only 1 lane went right for Kilminham

trellheim · 18-12-2007 12:37pm

ah but the RHS lane fills so people squash into the next lane [ the middle ] while turning, so blocking the middle lane.

Why no bus lane at Island Bridge?

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