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Does the observation of "safety in numbers" in road-traffic statistics correspond to a power-law scaling relationship? How do we test it, and how do we interpret it? Work in progress.

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This repository accompanies the document Injury_linearity.pdf.

It contains all code and data used to produce the figures therein.

The key questions are:

  • Does the observation of "safety in numbers" in road-traffic statistics correspond to a power-law scaling relationship?
  • How do we test it, and
  • how do we interpret it?

Column labels for england_LAs/data/england_models_all_data

  • LA_Name - name of local authority
  • Year -
  • code - code of local authority
  • population - LA population
  • dens - population density
  • whw - all casualties with at least one other vehicle
  • nov - all casualties with no other vehicle
  • count - whw+nov
  • whw_ksi - all KSI casualties with at least one other vehicle
  • nov_ksi - all KSI casualties with no other vehicle
  • whw_fatal - all fatal casualties with at least one other vehicle
  • nov_fatal - all fatal casualties with no other vehicle
  • whw_bike - bike casualties with at least one other vehicle
  • nov_bike - bike KSI casualties with no other vehicle
  • whw_ksi_bike - bike KSI casualties with at least one other vehicle
  • nov_ksi_bike - bike KSI casualties with no other vehicle
  • whw_fatal_bike - bike fatal casualties with at least one other vehicle
  • nov_fatal_bike - bike fatal casualties with no other vehicle
  • whw_bike_car - bike casualties with at least one car involved
  • whw_ksi_bike_car - bike KSI casualties with at least one car involved
  • whw_fatal_bike_car - bike fatal casualties with at least car involved
  • Region_Name - region local authority resides in
  • Pedal.Cycles - total distance travelled on A+B roads
  • Two.Wheeled.Motor.Vehicles - total distance travelled on A+B roads
  • Car - total distance travelled on A+B roads
  • Bus - total distance travelled on A+B roads
  • LGV - total distance travelled on A+B roads
  • HGV - total distance travelled on A+B roads
  • All.Motor.Vehicles - total distance travelled on A+B roads
  • total_travel - total distance travelled on A+B roads - All.Motor.Vehicles+Pedal.Cycles
  • Motorway - total road length
  • A - total road length
  • B - total road length
  • total_road - total road length - A+B+Motorway
  • AB - total road length - A+B
  • ruralpercent - fraction of population classed as living in a 'rural' area in 2011

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Does the observation of "safety in numbers" in road-traffic statistics correspond to a power-law scaling relationship? How do we test it, and how do we interpret it? Work in progress.

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