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Fig. 1. Map of Manchester Airport showing Terminal 1, the taxiways and groups of
gates, Google satellite map, Imagery c
2013 Google
2013 TerraMetrics, Map data c
This type of blocking can be observed only at the area close to the gates. Fig-
ure 2a shows an example of push back blocking where flight F 1 is pushing back
towards flight F 2. One of the aircraft needs to wait until the other has finished.
(a) push-back blocking
(b) taxi blocking
Fig. 2. Two different types of conflicts
Taxi blocking occurs either when there are two aircraft going in opposite
directions along a straight piece of a taxiway, as shown in Figure 2b, or when
two taxiways cross and two aircraft happen to be at the crossing point at the
same time. Taxi blocking may occur not only at the gates but also further along
the taxiways, for aircraft on the way to/from the runway. It occurs especially
around bottlenecks where multiple taxiways converge. Only the area at the gates
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