Openttd signals explained3/31/2023 The only reason why you should ever use PBS is when there is too little space to place all the pre-signals. The main reason to not use PBS is that pre-signals are more controllable and the general use of PBS is discouraged. The preferred method here is the pre-signal doubled bridges as the PBS method can lead to pathfinder issues in some very special cases. This kind of doubling comes naturally if you want to solve the problem with the last one: use pre-signals or PBS to stop trains from entering the splitter when they shouldn’t. This is why it is preferred never to use this type of bridge doubling. In normal traffic this isn’t much of a problem but at places where the traffic is likely to stop, at a merger for example, or during a jam this can become a big problem. Trains can enter the split while both bridges are occupied and thus wait longer than necessary. Naturally this is the most simple and the easiest solution, it does have a big drawback though. This is very useful for doubled bridges as the occupied bridge has a higher penalty and is less likely to be chosen. This balances trains over two or more tracks depending on the status of the first 10 signals on those tracks. Since the introduction of YAPF (Yet Another Path Finder) we’ve had the auto-balancer. This is shown in the second screenshot below(note that this is a special case as no proper joining and splitting can be inserted here). Which length you prefer is up to you but if the distance between the join and the split is more than train length + 2 then you should always join in between! If it is not then you should not rejoin and keep two different tracks side by side, note that you should view these lines as bridges with signals and it is prefered not to make any other splits or joins on them. For TL5 this should not be done as it is slow for one of the paths. If you consider the first screenshot below then it would technically be fine to use it with T元 or shorter but I personally prefer to do this only for TL1 because the train fits in between the presignal and the signal which marks the end of the double bridges. I don’t join and re-split tracks when the distance of the join/split is shorter than the train length + 2. If you need to cross two lines after each other it is important to note that your double bridges should never influence trains with regards to corner lengths. I know this sounds counter intuitive but it is what it is and when you look at the history (see the introduction) you’ll see why. The double bridge is a special case of the normal track and it should be considered as normal track and not as a traffic balancer. Waiting bays in front of the double bridges are of no use and should be avoided. Any extra track counts towards the signal gap and is thus undesirable. This means that right before and after your bridges you have one straight piece of track for your signals and right before/after that you have the split or join. Because of this you should also keep your split and join as close to the bridges as possible. Underneath I will discuss these and explain what you should and shouldn’t do.įor the rest of the article I will be talking about doubled bridges only, but all of this applies to double tunnels too as there is no difference between them.Ī doubled bridge should always be as short as is possible so the signal gap is as small as possible and the least amount of disturbance to the trains is caused. Unfortunately there are proper ways to do this and wrong ways to do it. Because bridges and tunnels don’t allow signals on/in them you will soon notice that you get slowdowns at them, the common solution is to use two bridges or tunnels for the same line and have their combined capacity compensate for the lack of signals. When you just start out this will be done by just simple level crossings which aren’t very efficient (except when using YAPP/PBS), later on you will start using bridges and tunnels to do this so different tracks don’t influence each other. From the very start that you start building networks in OpenTTD you’ll need to have different tracks crossing each other.
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