N20/N72 - Mallow Roundabout Upgrade

Isambard

meanwhile the N72/N20 roundabout is surfaced and marking out is in hand.

boardsuser1

Isambard wrote: »

meanwhile the N72/N20 roundabout is surfaced and marking out is in hand.

Any photo?

Isambard

Cork Truck Driver wrote: »

Any photo?

i'll try and get over there and get one for tomorrow if noone else can oblige

Isambard

took a while , but here's one for you. Lots of people still sticking to the old lanes of course.

grogi

Isambard wrote: »

took a while , but here's one for you. Lots of people still sticking to the old lanes of course.

What a disgrace... Are we genetically incapable of making a high-throughput roundabout that is not ambiguous in this country?!

Isambard

what's ambiguous about it?

grogi

Isambard wrote: »

what's ambiguous about it?

Exiting to the south from right lane for instance. Despite following the arrows when entering the RB, you still need to give way to the cars in the left lane.

Ambiguous use of dashed lines is the second. In developed countries the lanes on the RB are marked with long dashes, while the lane guidance at the entrance is using short dashes. In here I can imagine cars that are going from the west to south migrating from the left to the right lane at the north-most point of the roundabout.

Isambard

no you don't. If you are coming from the N72 the rh lane is for right turns and the left lane is for left turn and straight on.

grogi

Isambard wrote: »

no you don't. If you are coming from the N72 the rh lane is for right turns and the left lane is for left turn and straight on.

Yes, but the dashed line says different story. Two signs signal different things...

Isambard

they merely divide the two lanes.

grogi

Isambard wrote: »

they merely divide the two lanes.

Exactly. They divide two lanes. The moment you cross a lane divider (AKA dashed line) you need to yield to the cars in the lane you're entering.

Compare with my photoshop and you'll see the difference...

Isambard

that's what your indicators are for and your roadcraft

Middle Man

grogi wrote: »

What a disgrace... Are we genetically incapable of making a high-throughput roundabout that is not ambiguous in this country?!

It could be worse - at least the design is using the more traditional English type geometry with reasonably smooth curves. The new Irish type geometry is much worse with virtual 90 deg turns into the circulatory carriageway.

grogi

Isambard wrote: »

that's what your indicators are for and your roadcraft

I'll manage, not to worry. Driving an old crap with scratches all around and a bull bar helps a lot...

But the road marking should be there to help, not to disorient.

Kevwoody

grogi wrote: »

I'll manage, not to worry. Driving an old crap with scratches all around and a bull bar helps a lot...

But the road marking should be there to help, not to disorient.

Absolutely nothing wrong with the road marking in my opinion. Your photoshopped version just looks cluttered and over complicated

grogi

Kevwoody wrote: »

Absolutely nothing wrong with the road marking in my opinion.

It the same design used from many years. It simply is inadequate for today traffic volume. Turbine RB are much more efficient with dealing with traffic.

Your photoshopped version just looks cluttered and over complicated

It might from that perspective, photoshoping in Paint does not help either.

It's completely different story if you are in the car. The lines just guide you through the roundabout, once you enter fro the right lane you don't cross any lanes.

That's the schematics of such RB, even oriented the same way. It's not a new idea, it works very well.

Isambard

i can't understand the preoccupation with crossing lanes. You indicate your intention at the exit before the one you are taking, noone should be moving up on you on your nearside so what's the problem?

Your scheme has two areas where there is only one lane whereas the intention of the works is to make the roundabout two lane. You also have reversed the N72 lanes which would cause congestion where the bulk of the traffic goes to the right or straight on and in your scheme that would all be confined to one lane , rather than split between two lanes.

two wheels good

Why is there a STOP sign on one approach to the RB? A vehicle is expected to halt when the RB is empty?
EDIT: referring to the previous photo.

Isambard

always was a stop sign there, but as they have put YIELD signs on the road, I imagine it will be removed.

grogi

two wheels good wrote: »

Why is there a STOP sign on one approach to the RB? A vehicle is expected to halt when the RB is empty?

That's what the stop sign is for, right? Stop and yield.

marno21

There was always stop signs at that roundabout, likely haven't been removed yet

Isambard

stop and yield are different from each other.

grogi

Isambard wrote: »

stop and yield are different from each other.

So is it Stop and don't yield?!

Isambard

I suspect you know full well

marno21

Mod: road sign functions are off topic for this thread. Please discuss elsewhere as appropriate

Back to M20

Middle Man

grogi wrote: »

It the same design used from many years. It simply is inadequate for today traffic volume. Turbine RB are much more efficient with dealing with traffic.



It might from that perspective, photoshoping in Paint does not help either.

It's completely different story if you are in the car. The lines just guide you through the roundabout, once you enter fro the right lane you don't cross any lanes.

That's the schematics of such RB, even oriented the same way. It's not a new idea, it works very well.

That is a turbo roundabout - a design that is commonly used in the Netherlands.

grogi

Middle Man wrote: »

That is a turbo roundabout - a design that is commonly used in the Netherlands.

Not only - from France to Poland, almost all newly build RB are like that. But it was the Dutch that started to use it I think.

Mc Love

Most irish people still wont be able to use it properly

Isambard

it wont work in this application for the reasons I gave in post 3232.

boardsuser1

Isambard wrote: »

it wont work in this application for the reasons I gave in post 3232.

Just looked at it, that Marno21

grogi

Middle Man wrote: »

It could be worse - at least the design is using the more traditional English type geometry with reasonably smooth curves. The new Irish type geometry is much worse with virtual 90 deg turns into the circulatory carriageway.

I haven't met one yet fortunately, do you have a picture/Google maps link?