Hi to all my fellow members

Negotiating a roundabout would seem to have always had it's problems. The solution to a smooth transition through said obstacle is reasonably simple, providing only one vehicle at a time enters. Clearly this can be achieved with the use of TC's on both entrance and exit. The problem arises when there are multiple vehicles either passing onto the roundabout or travelling around the roundabout before exiting.

Having spent a number of hours trying to perfect a solution to this problem I have to admit to defeat. With my solution things seem to work for a period of time but then go completely off the rails, so to speak. My conclusion is to reason that variables and a counter system for each junction are the answer, but I have to say that my attempts, through limited knowledge, to implement these elements has also drawn a blank.

So my question to you all is, "Has anyone solved this issue" and if so would you be so kind as to point me in the right direction.

Cheers from a somewhat dizzy member

Pete

2 minutes ago, 220hotwheels said:

Hi to all my fellow members

Negotiating a roundabout would seem to have always had it's problems. The solution to a smooth transition through said obstacle is reasonably simple, providing only one vehicle at a time enters. Clearly this can be achieved with the use of TC's on both entrance and exit. The problem arises when there are multiple vehicles either passing onto the roundabout or travelling around the roundabout before exiting.

Having spent a number of hours trying to perfect a solution to this problem I have to admit to defeat. With my solution things seem to work for a period of time but then go completely off the rails, so to speak. My conclusion is to reason that variables and a counter system for each junction are the answer, but I have to say that my attempts, through limited knowledge, to implement these elements has also drawn a blank.

So my question to you all is, "Has anyone solved this issue" and if so would you be so kind as to point me in the right direction.

Cheers from a somewhat dizzy member

Pete

Apologies, I forgot to attach my attempt thus far.

Test roundabout control.mbp

Pete...

I imported this layout, and let it run for quite some time (enough to brew a pot of tea...), and found it to work almost perfectly. On two occasions, a pair of vehicles would try to occupy the same spot, and so linked together, but their different pathways made them separate again at the earliest opportunity. Whilst, technically, a Road Traffic Incident, and some dented bodywork, it resolved itself amicably and the World spun on. I didn't see any more chaos than that. Maybe if I left it running for a day or so, I don't know..? It looks to be about as robust a system as I've seen; I didn't try to delve into its workings to 'improve' it at all (I doubt that I could...).
What, precisely, went wrong for you..? How did the 'chaos' manifest itself..? I saw none; was I just lucky..?

Ich habe diese Anlage importiert und sie eine ganze Weile laufen lassen (genug, um mir eine Kanne Tee zu kochen...) und festgestellt, dass sie fast perfekt funktionierte. Zweimal versuchten zwei Fahrzeuge, denselben Platz zu belegen und kollidierten so, aber ihre unterschiedlichen Fahrwege führten dazu, dass sie sich bei nächster Gelegenheit wieder trennten. Technisch gesehen war das zwar ein Verkehrsunfall mit einigen Dellen, aber er löste sich von selbst und die Welt drehte sich weiter. Mehr Chaos habe ich nicht bemerkt. Vielleicht wäre es anders gewesen, wenn ich sie einen Tag oder so laufen gelassen hätte, ich weiß es nicht...? Es scheint eines der robustesten Systeme zu sein, die ich kenne; ich habe gar nicht erst versucht, es zu „verbessern“ (ich bezweifle, dass ich das könnte...).

Was genau ist bei dir schiefgelaufen? Wie hat sich das „Chaos“ geäußert? Ich habe nichts bemerkt; hatte ich einfach nur Glück?

Douglas

1 hour ago, Dad3353 said:

Pete...

I imported this layout, and let it run for quite some time (enough to brew a pot of tea...), and found it to work almost perfectly. On two occasions, a pair of vehicles would try to occupy the same spot, and so linked together, but their different pathways made them separate again at the earliest opportunity. Whilst, technically, a Road Traffic Incident, and some dented bodywork, it resolved itself amicably and the World spun on. I didn't see any more chaos than that. Maybe if I left it running for a day or so, I don't know..? It looks to be about as robust a system as I've seen; I didn't try to delve into its workings to 'improve' it at all (I doubt that I could...).
What, precisely, went wrong for you..? How did the 'chaos' manifest itself..? I saw none; was I just lucky..?

Ich habe diese Anlage importiert und sie eine ganze Weile laufen lassen (genug, um mir eine Kanne Tee zu kochen...) und festgestellt, dass sie fast perfekt funktionierte. Zweimal versuchten zwei Fahrzeuge, denselben Platz zu belegen und kollidierten so, aber ihre unterschiedlichen Fahrwege führten dazu, dass sie sich bei nächster Gelegenheit wieder trennten. Technisch gesehen war das zwar ein Verkehrsunfall mit einigen Dellen, aber er löste sich von selbst und die Welt drehte sich weiter. Mehr Chaos habe ich nicht bemerkt. Vielleicht wäre es anders gewesen, wenn ich sie einen Tag oder so laufen gelassen hätte, ich weiß es nicht...? Es scheint eines der robustesten Systeme zu sein, die ich kenne; ich habe gar nicht erst versucht, es zu „verbessern“ (ich bezweifle, dass ich das könnte...).

Was genau ist bei dir schiefgelaufen? Wie hat sich das „Chaos“ geäußert? Ich habe nichts bemerkt; hatte ich einfach nur Glück?

Douglas

Hi Douglas

It's great to see you back on the forum, your views have always been so beneficial and informative. What you have explained that went wrong for you is precisely the issue that I also have and which I am trying to resolve, at present not awfully successfully. Being mindful of the probability of both road rage and potential nasty insurance claims, I felt that my solution should not be finalised as is but still requires work in order to achieve 98% perfection, so still a way to go yet. Once the flow around the roundabout is satisfactory for cars and small vans then I will need to introduce the odd truck, larger van and bus, but for now that headache is well and truly on the back burner.

All the very best, take care

Pete