Definition of a Motorway at a Interchange

annfield1978

As far as 'I know, a motorway starts at the top of the ramps at an interchange,but where is this stated? is it in the roads traffic act or DMRB? is the overbridge at a grade separated junction part of the motorway?

Chris_5339762

In those cases, the sliproad leading to the motorway is also motorway. The rule is that if a road connecting with a motorway is inescapable (ie: you cant drive anywhere but towards the motorway without reversing and being a pillock), then it is also by de-facto motorway.

The Word Is Bor

The Motorway Order for each motorway states exactly where each motorway starts and terminates, including sliproads.

annfield1978

Chris_5339762 wrote: »

In those cases, the sliproad leading to the motorway is also motorway. The rule is that if a road connecting with a motorway is inescapable (ie: you cant drive anywhere but towards the motorway without reversing and being a pillock), then it is also by de-facto motorway.

where is this described? how do you get hold of motorway orders?

icdg

annfield1978 wrote: »

where is this described? how do you get hold of motorway orders?

Actually getting hold of Motorway Orders (the old fashioned ones) are hard. Here is the only one I know of on the internet, which is the M17's:

http://www.galway.ie/en/Services/RoadsTransportation/RoadProjects/m17/mo.htm

The Roads Act 2007 versions (which reclassify existing roads) are (all two of them) on the eISB website at www.irishstatutebook.ie .

As for slip roads forming part of motorways, its pure logic. Once you get to a point that prohibited traffic has no way of leaving the motorway, then that road is also a motorway. Unfortunately certain councils have a habit of putting Start of Motorway Regulations signs at the very bottom of sliproads (Kildare, Laois, I'm looking at you in particular) wheras these signs belong at the START of sliproads. But for the most part its done properly, cf the M50 upgrade (although they put the End of Motorway signs in the wrong place at certain junctions, and put Start of Motorway Regulations signs for motorway-motorway movements at the M1-M50 junction where they are not required at all!). Cf for example the M1 Airport spur - you don't join the M1 proper for the best part of 1km, at a signal controlled roundabout - yet the Start of Motorway Regulations sign is exactly where it is supposed to be, at the R132/Airport roundabout, placing the entire spur (and an entire roundabout) under motorway regulations like it should be.

Tech3

annfield1978 wrote: »

where is this described?

Years of roadgeeking I would imagine. An example would be the N10 which has no junction to turn off towards the M9 interchange and leads straight to motorway, in this case the N10 should be M10.

An overbridge on part of a GSJ would not be under motorway restrictions given there is a local road leading onto the dumbell arrangement.

rubensni

Whenever you pass a road that doesn't lead anywhere else but to a motorway, that's where the regulations start.