G. F. Newell’s research while affiliated with University of California, Berkeley and other places

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Publications (1)


Unstable Brownian Motion of a Bus Trip
  • Chapter

January 1977

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48 Reads

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36 Citations

G. F. Newell

As a bus travels along a route, its trip time between successive bus stops is subject to random fluctuations. If the bus should fall behind schedule because of this, then some excess passengers will have arrived at the bus stops during the late time and it will take the bus longer to load passengers. A bus, therefore, tends to travel slower and falls even further behind schedule. To compensate for this, the usual strategy of control used by bus operators is to provide some slack time in the schedule so that, normally, a bus can gain some time. The bus then operates under a rule that it may not leave a bus stop ahead of schedule, but will leave immediately if it is late. Actually, this control is not completely stable; if a bus falls so far behind schedule that the extra loading time generated by the lateness exceeds the slack time, the bus will still fall progressively further behind schedule.

Citations (1)


... Most of the methods developed at the operational level regulate the real-time movement of vehicles (vehicle holding, skipping stops, limited passenger access, earlier vehicle turning), while very few focus on increasing the robustness/resistance of the PPT system to the emergence and expansion of headway disturbances. In the latter case, this is typically achieved through prioritisation of PPT vehicles at signalised intersections (Diakaki et (Newell 1977;Carey 1998;Zhao et al. 2006), introducing a PPT lane (Shalaby 1999;Nash 2003), and increasing passenger boarding intensity (Milkovits 2008;Sun et al. 2014). ...

Reference:

Planning-level optimisation of headway regularity
Unstable Brownian Motion of a Bus Trip
  • Citing Chapter
  • January 1977