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London Buses (not a debate)
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<blockquote data-quote="BKG93" data-source="post: 136296" data-attributes="member: 14656"><p>'Headway' in London, is a system that is used on a lot of its busier routes where frequency is high, and delays are common. </p><p></p><p>For example, route 55 travels into Central London, so sticking to a timetable where buses are every 6 minutes would be incredibly difficult, as even being 3 minutes late would leave triple the gap in front compared to behind. So what they do, is they have a rough timetable set out (mainly for administration purposes like when and where to change drivers etc), but this timetable is not published publicly just the phrase "every 6 minutes". The gap of 6 minutes between buses is prioritised over the timetable, so if the bus in front becomes 5 minutes late, every vehicle behind will be made 5 minutes late to preserve the 6 minute gap. Eventually the 5 minute gap works its way round the entire route and all 35 buses are back with an even headway.</p><p></p><p>Normally the holding is done at terminus', because on routes like that, if one bus encounters delays, the bus only a few minutes behind will encounter the same delays, but its also not uncommon to be asked to wait mid journey. </p><p></p><p>It generally works well in Central London, when routes are as frequent as every couple of minutes, the passenger is not aware a bus could be 10 or 20 minutes late, or even more in some cases, as long as the service is every couple of minutes. Its a similar system to what is used on tube trains I believe.</p><p></p><p>So in the case of your 55, that most likely means the bus in front was late, and your bus was being held to even out the gaps in the service, although for a 6 minute frequency route to get 10 minutes behind its headway position is not very common, normally they're held once they drift out by a couple of minutes.</p></blockquote><p></p>
[QUOTE="BKG93, post: 136296, member: 14656"] 'Headway' in London, is a system that is used on a lot of its busier routes where frequency is high, and delays are common. For example, route 55 travels into Central London, so sticking to a timetable where buses are every 6 minutes would be incredibly difficult, as even being 3 minutes late would leave triple the gap in front compared to behind. So what they do, is they have a rough timetable set out (mainly for administration purposes like when and where to change drivers etc), but this timetable is not published publicly just the phrase "every 6 minutes". The gap of 6 minutes between buses is prioritised over the timetable, so if the bus in front becomes 5 minutes late, every vehicle behind will be made 5 minutes late to preserve the 6 minute gap. Eventually the 5 minute gap works its way round the entire route and all 35 buses are back with an even headway. Normally the holding is done at terminus', because on routes like that, if one bus encounters delays, the bus only a few minutes behind will encounter the same delays, but its also not uncommon to be asked to wait mid journey. It generally works well in Central London, when routes are as frequent as every couple of minutes, the passenger is not aware a bus could be 10 or 20 minutes late, or even more in some cases, as long as the service is every couple of minutes. Its a similar system to what is used on tube trains I believe. So in the case of your 55, that most likely means the bus in front was late, and your bus was being held to even out the gaps in the service, although for a 6 minute frequency route to get 10 minutes behind its headway position is not very common, normally they're held once they drift out by a couple of minutes. [/QUOTE]
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