Car Versus Walk Calculator

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Scenario
 
The Car Versus Walking calculator is designed for a simple radial corridor. A person travelling to the city centre by car has 3 alternatives:
  1. To travel by car, and pay to park at the city centre with a walk to their final destination.
  2. To park at the railway station and travel to the city centre by train, followed by a walk to their final destination.
  3. To walk all the way to the final destination.
Instructions
 
The calculator is very simple to complete. The factors in the Choice Situation, Choice Coefficients, walking conditions and Traffic sections are user defined. The Calculator displays the results in the Forecast section in green at the bottom of the table. The definitions of all the factors are shown below.
The Choice Situation
Car parking cost Parking charges at the city centre (in Pounds).
Car in-vehicle time Time taken for the car journey to the car park (in minutes).
Car walking time Time taken to walk from the city centre car park to the final destination (in minutes).
Time spent walking Time it takes to walk to the destination
The Choice Coefficients
The settings for the coefficients are low, med or high.
Quality of walking  Segregated walking route
Value of time The cost to the traveller (in financial terms) of the time spent travelling. Car drivers generally have a higher value of time than cyclist.
Walk/wait time From parking their car to actually boarding the bus and leaving for the city centre. This is usually dictated by the size of the Park & Ride parking area and the number of bus stops contained within the site.
In-vehicle time The speed of the service from the Park & Ride site to the city centre. Usually dictated by the number of stops the bus makes, and the standard of priority measures on the route.
Walking Conditions
The settings for the conditions are either Yes or No
Bad weather Weather conditions that would deter most people from walking.
The Traffic Situation
No. of car drivers with this choice The number of drivers travelling to the city centre.
Drivers committed to car Percentage of car drivers who will not walk under any circumstance.
The Model's Forecast (i.e. the model output)
No. of walkers Total number of car drivers converted to walking
No. of car drivers remaining Those drivers who will continue to travel to the city centre by car, shown both as a total number and a percentage.
Parking revenue lost Income lost from parking charges in the city centre as a result of the switch to walking