Skip-stop

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Skip-stop is a public transit service pattern which reduces travel times and increases capacity by not having all vehicles make all designated stops along a route. Skip-stops are used in both rail transit and bus transit operations.[1] It is also used to describe elevators that stop at alternating floors and hence also used to describe building designs that exploit this design and avoid corridors on alternating floors.

Rail operation[edit]

When skip stops are used in rail transit, the transit operator designates stations as either major or minor, typically by ridership. Usually, all vehicles stop at the major stations, but only some vehicles stop at the minor ones.

Since one rail vehicle can only pass another by using an additional track, skip-stop may require additional investment in infrastructure if express services, where trains skip many stops along a route, are employed simultaneously with vehicles making stops on every station.

In systems that have no extra track for a faster train to pass a slower train, skip-stop may be employed either during busier travel hours to reduce travel time of a particular train, or during off-peak hours to raise efficiency by not stopping on "unpopular" stations.

In some systems, such as the New York City Subway, these are considered as two separate services (J/Z, the former 1/9; and formerly the D/Q—the latter of which were in fact two separate services), as if the two services were separate lines instead of two different stopping patterns on the same line. On other systems, such as Philadelphia's SEPTA, they are distinguished by lights on the train, and stations skipped by half the trains are designated "A" and "B" stations depending on which trains stop there.

Chicago's CTA elevated system used skip-stop service from the 1940s until the early 1990s, at which point all-stop service patterns replaced skip-stop service. This was done to reduce waiting times for passengers riding to or from "A" and "B" stations who could only take half of the trains. It also eliminated the need for a train transfer for passengers riding from an "A" station to a "B" station which required a transfer at an "AB" (all trains stop) station to complete their trip. Further, the system was simpler to use for new riders and visitors.

Helsinki commuter rail[edit]

Helsinki commuter rail uses skip-stop services. Below there is a chart to demonstrate the skip-stop system in use, G and R trains are example of a skip-stop pair.

Y M
Karis/Karjaa  BSicon KDSTa.svg BSicon KDSTa.svg  Vantaankoski/Vandaforsen T H R Z
Ingå/Inkoo  BSicon DST.svg BSicon DST.svg  Martinlaakso/Mårtensdal BSicon KDSTa.svg BSicon KDSTa.svg BSicon KDSTa.svg  Riihimäki BSicon KDSTa.svg  Lahti/Lahtis
Siuntio/Sjundeå  BSicon DST.svg S U L BSicon DST.svg  Louhela/Klippsta BSicon DST.svg BSicon DST.svg BSicon DST.svg  Hyvinkää/Hyvinge BSicon STR.svg
Kirkkonummi/Kyrkslätt  BSicon DST.svg BSicon KDSTa.svg BSicon KDSTa.svg BSicon KDSTa.svg BSicon DST.svg  Myyrmäki/Myrbacka BSicon DST.svg BSicon DST.svg BSicon DST.svg  Jokela BSicon STR.svg
Tolsa/Tolls  BSicon STR.svg BSicon STR.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg  Malminkartano/Malmgård BSicon DST.svg BSicon DST.svg BSicon STR.svg  Nuppulinna  BSicon STR.svg
Jorvas  BSicon STR.svg BSicon STR.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg  Kannelmäki/Gamlas G BSicon DST.svg BSicon DST.svg BSicon STR.svg  Purola BSicon DST.svg  Mäntsälä
Masala/Masaby  BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg  Pohjois‑Haaga/Norra Haga BSicon KDSTa.svg BSicon DST.svg BSicon DST.svg BSicon STR.svg  Saunakallio  BSicon STR.svg
Luoma/Bobäck  BSicon STR.svg BSicon STR.svg BSicon DST.svg BSicon DST.svg BSicon LSTR.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg  Järvenpää/Träskända BSicon DST.svg  Haarajoki
Mankki/Mankby  BSicon STR.svg BSicon STR.svg BSicon DST.svg BSicon DST.svg E BSicon LSTR.svg K N BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon STR.svg  Kyrölä BSicon STR.svg
Kauklahti/Köklax  BSicon STR.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon KDSTa.svg BSicon LSTR.svg BSicon KDSTa.svg BSicon KDSTa.svg BSicon STR.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg ––––––––––––––––––– BSicon DST.svg  Kerava/Kervo
Espoo/Esbo  BSicon STR.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon LSTR.svg BSicon DST.svg BSicon DST.svg BSicon STR.svg BSicon DST.svg BSicon STR.svg BSicon STR.svg ––––––––––––––––––– BSicon STR.svg  Savio
Tuomarila/Domsby  BSicon STR.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon LSTR.svg BSicon DST.svg BSicon DST.svg BSicon STR.svg BSicon DST.svg BSicon STR.svg BSicon STR.svg ––––––––––––––––––– BSicon STR.svg  Korso
Koivuhovi/Björkgård  BSicon STR.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon LSTR.svg BSicon DST.svg BSicon DST.svg BSicon STR.svg BSicon DST.svg BSicon STR.svg BSicon STR.svg ––––––––––––––––––– BSicon STR.svg  Rekola/Räckhals
Kauniainen/Grankulla  BSicon STR.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon LSTR.svg BSicon DST.svg BSicon DST.svg BSicon STR.svg BSicon DST.svg BSicon STR.svg BSicon STR.svg ––––––––––––––––––– BSicon STR.svg  Koivukylä/Björkby
Kera  BSicon STR.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon LSTR.svg I BSicon DST.svg BSicon DST.svg BSicon STR.svg BSicon DST.svg BSicon STR.svg BSicon STR.svg ––––––––––––––––––– BSicon STR.svg  Hiekkaharju/Sandkulla
Kilo  BSicon STR.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg A BSicon LSTR.svg BSicon KDSTa.svg BSicon DST.svg BSicon DST.svg BSicon STR.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg ––––––––––––––––––– BSicon DST.svg  Tikkurila/Dickursby
Leppävaara/Alberga  BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon KDSTa.svg BSicon LSTR.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon STR.svg BSicon DST.svg BSicon STR.svg BSicon STR.svg ––––––––––––––––––– BSicon STR.svg  Puistola/Parkstad
Mäkkylä  BSicon STR.svg BSicon STR.svg BSicon STR.svg BSicon DST.svg BSicon STR.svg BSicon DST.svg BSicon LSTR.svg BSicon DST.svg BSicon STR.svg BSicon DST.svg BSicon STR.svg BSicon DST.svg BSicon STR.svg BSicon STR.svg ––––––––––––––––––– BSicon STR.svg  Tapanila/Mosabacka
Pitäjänmäki/Sockenbacka  BSicon STR.svg BSicon STR.svg BSicon STR.svg BSicon DST.svg BSicon STR.svg BSicon DST.svg BSicon LSTR.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon STR.svg BSicon DST.svg BSicon STR.svg BSicon STR.svg ––––––––––––––––––– BSicon STR.svg  Malmi/Malm
Valimo/Gjuteriet  BSicon STR.svg BSicon STR.svg BSicon STR.svg BSicon DST.svg BSicon STR.svg BSicon DST.svg BSicon LSTR.svg BSicon DST.svg BSicon STR.svg BSicon DST.svg BSicon STR.svg BSicon DST.svg BSicon STR.svg BSicon STR.svg ––––––––––––––––––– BSicon STR.svg  Pukinmäki/Bocksbacka
Huopalahti/Hoplax  BSicon STR.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg –– BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon STR.svg BSicon DST.svg BSicon STR.svg BSicon STR.svg ––––––––––––––––––– BSicon STR.svg  Oulunkylä/Åggelby
Ilmala  BSicon STR.svg BSicon STR.svg BSicon STR.svg BSicon DST.svg BSicon STR.svg BSicon DST.svg –– BSicon DST.svg BSicon DST.svg BSicon STR.svg BSicon DST.svg BSicon STR.svg BSicon DST.svg BSicon STR.svg BSicon STR.svg ––––––––––––––––––– BSicon STR.svg  Käpylä/Kottby
Pasila/Böle  BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg –– BSicon DST.svg ––––––––––––––– BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg BSicon DST.svg ––––––––––––––––––– BSicon DST.svg  Pasila/Böle
Helsinki/Helsingfors  BSicon KDSTe.svg BSicon KDSTe.svg BSicon KDSTe.svg BSicon KDSTe.svg BSicon KDSTe.svg BSicon KDSTe.svg –– BSicon KDSTe.svg ––––––––––––––– BSicon KDSTe.svg BSicon KDSTe.svg BSicon KDSTe.svg BSicon KDSTe.svg BSicon KDSTe.svg BSicon KDSTe.svg BSicon KDSTe.svg ––––––––––––––––––– BSicon KDSTe.svg  Helsinki/Helsingfors
Y S U L E A x M xx I K N G T H R Z


Bus operation[edit]

In bus operations, skip-stop refers to a stopping pattern where buses do not stop at every block or at every designated bus stop, typically in a central business district. Skip-stop operation reduces travel time and increases the number of buses that the streets and bus stops are able to accommodate. With skip-stop operations, bus routes are typically grouped together by geographic area in order to provide a common stop for areas that are served by multiple routes. The skip-stop groups are sometimes identified by color or letter so that passengers and bus operators can easily identify their desired stop. A disadvantage with skip-stops is that passengers may have to walk farther or change buses to catch their intended bus, which increases travel time. Passengers may also be unsure about which bus stop to walk towards to catch their intended bus.

Skip-stops work best when buses are able to easily pass each other at bus stops, such as on a low-traffic street, street with bus stop pockets or dedicated busway with at least two lanes in each direction. If there is a large amount of other traffic on the street or only a single bus lane is provided, then buses have difficulty passing each other and much of the benefit of using skip-stops is not realized.

In Seattle, WA, which has an extensive local and regional bus system operated by three different transit agencies, skip-stops are used on 2nd, 3rd, and 4th Avenues in the downtown area. Bus routes on 3rd Avenue are grouped into Blue and Yellow stops, while bus routes on 2nd and 4th Avenue are grouped into Red and White stops.

In Portland, Oregon, buses of TriMet and C-Tran use skip stops on the Portland Transit Mall in Downtown Portland. The practice has been in use on the mall since its opening in 1977, and was continued (for buses) after MAX Light Rail was added to the mall in 2009. Buses stop at every third or fourth bus stop. Until 2007, the bus stops for the different groups of routes were identified by colors and symbols, such as "Yellow Rose" and "Orange Deer", but with the rebuilding for the addition of light rail, those designations were replaced by simple letters — A, B, C, D for southbound on 5th Avenue and W, X, Y, Z for northbound on 6th Avenue.

See also[edit]

References[edit]