[RFD] Constructing roads

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Post by Dave » 13 Nov 2006 19:24

Well, unless it's the end of the motorway, motorways in Britain never connect with another road except by means of a junction - the likes of which we see in several pictures... And also see below. There are NO level crossings on motorways - nor dual carriageways (I don't think).

Thus - motorways are not interconnectable. This means we may need to specify "slip roads". I don't know what it is in other languages.

I'll describe below.

Excuse the bad drawings.
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Post by Purno » 13 Nov 2006 19:35

Dave Worley wrote:Thus - motorways are not interconnectable. This means we may need to specify "slip roads". I don't know what it is in other languages.
Yeah, but motorways are interconnectable ( = connectable to each other, I assmume) via the usual big crossings (whatever they're called).
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Post by Dave » 13 Nov 2006 19:40

Yes I was going there next :P

They're called interchanges and flyovers.

There are several designs of these tho, depending on the purpose the junction has.

Thus, I think it wise that we give people the option to build freely but select "slip road" as a buildable option.
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Post by XeryusTC » 13 Nov 2006 20:04

Is a slip road a oneway road connecting one side of motorway A with one side on motorway B? Like the circles in the cloverloaf?
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Post by m4rek » 13 Nov 2006 20:06

all the pink lines in the drawings are sliproads
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Post by Dave » 13 Nov 2006 20:11

Sliproads also connect motorways with their junctions - which are usually above or below. Never on the same level though.
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Post by m3henry » 13 Nov 2006 20:13

XeryusTC wrote:Is a slip road a oneway road connecting one side of motorway A with one side on motorway B? Like the circles in the cloverloaf?
yes
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Post by Hyronymus » 13 Nov 2006 21:00

SimCity 4 calls them on-ramps, if that helps. But I think we can conclude that everyone agrees that motorways need a sophisticated way of crossing each other.

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Post by Dave » 13 Nov 2006 22:54

Hyronymus wrote:SimCity 4 calls them on-ramps, if that helps. But I think we can conclude that everyone agrees that motorways need a sophisticated way of crossing each other.
That is the American term, yes.
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Post by Purno » 14 Nov 2006 07:13

Dave Worley wrote:Thus, I think it wise that we give people the option to build freely but select "slip road" as a buildable option.
I'm not sure about that. I think I'd prefer the SimCity 3000* way, where a slip road is 1 piece of 1 pre-defined size (dependable on the type of crossing tho) which can be built.

Either that or have pre-designed flyovers and such.
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Post by aarona » 14 Nov 2006 11:21

I would agree with making it SimCity-ish. Its a proven formula, simple to implement and does the job.

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Post by Purno » 14 Nov 2006 11:23

It's simple for the player too. :wink:
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Post by m4rek » 14 Nov 2006 17:50

i never actually figured out how to do sliproads in SimCity...

oh wait, i did, but that was just before i got bored of the game and stopped playing
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Post by Dave » 15 Nov 2006 21:58

aarona wrote:I would agree with making it SimCity-ish. Its a proven formula, simple to implement and does the job.
Could you get a couple of screenshots for me?

I think if we're agreed, we can start discussing other roads.

For example - motorways in Britain are three lanes wide - But what about dual carriageways that are two?
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Post by Hyronymus » 15 Nov 2006 22:50

Dual carriageways are double-deck motorways, right? I suggest we start simple. Also, note that motorways are 2-lanes per tile according the DD. I think that's silly.

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Post by Dave » 15 Nov 2006 22:55

Hyronymus wrote:Dual carriageways are double-deck motorways, right? I suggest we start simple. Also, note that motorways are 2-lanes per tile according the DD. I think that's silly.
No - a carriageway is one lane of traffic.

A dual carriageway is two lanes of traffic in either direction.

In Britain a motorway is three.

Since I assume a road will = one tile, then a motorway could be three tiles wide?

(One way up road on left tile, two way road on middle tile with special graphical seperation, one way down road on right tile)
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Post by aarona » 16 Nov 2006 02:31

Here is a picture from Sim City 4 (Rush Hour) which shows a "motorway", with a motorway junction and on and off ramps. (top right of the screen)

I'm glad the British have a sensible naming system. We have freeways which change from 2 lanes both-way, to 3, to 4 and 5 (with or without a dedicated bus lane). Some also have rail going down the middle between the two directions.
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Post by Dave » 16 Nov 2006 11:00

aarona wrote:Here is a picture from Sim City 4 (Rush Hour) which shows a "motorway", with a motorway junction and on and off ramps. (top right of the screen)

I'm glad the British have a sensible naming system. We have freeways which change from 2 lanes both-way, to 3, to 4 and 5 (with or without a dedicated bus lane). Some also have rail going down the middle between the two directions.
Well I say three lanes loosely.

In the middle of complicated junctions, there'll often be a fourth lane to give drivers two lanes each for each direction. Then for a while there'll be two lanes, then it'll grow to three again.

There are *some* discrepancies but generally British motorways are three lanes.

Incidentally, in Britain we have the usual way of numbering motorways - M1, M4, M5, M6, M25, M40, M62 and so on and so forth.

But there is also a secondary category for roads that were originally A-roads (that is to say "primary" routes) that have been given motorway status.

These are usually referred to with an M in brackets. So the Aston Expressway in Birmingham (which leads to Spaghetti Junction on the M6) is the A38(M).

It's a little more confusing than I've made out.

Motorways - generally 3 lanes, occasionally 4 in busy sections.
A-Roads with Motorway status - generally 2 lanes, with 3 in some areas.
A-Roads - "Trunk roads" are often dual carriageways and are the main routes where motorways don't apply. A lot of A-Roads are single carriageway (that is one lane in either direction), especially in urban areas. I personally live on the A491.
B-Roads - Are almost always single carriageway and are like minor routes. The B4173 diverges from the A491 a little way down the road and carries traffic to the main road at the bottom a little closer to Stourbridge than the A491 does.
Unclassified roads are usually streets - and occasionally small countryside roads. In the cities, they will generally be a normal single carriageway but in the countryside they may be single track - that is only one car's width. Then there are passing places for cars to stop and let others through and so on.

As I said - a little more confusing than I made out, but to be honest - and I'm sounding my own country's horn a little here - I think it's a top-notch classification system that far outstrips that of the Continental countries.
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Post by Purno » 16 Nov 2006 11:45

We don't need 2*3 lane roads if there's no ordinary traffic at them.
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Post by Hyronymus » 16 Nov 2006 12:15

No, indeed, just 2 x 2 should do :).

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