Name 
Symbol 
Definition 
Equation 

Age group adjusted composite accessibility score 
C_{Age Group} 
This combines all the age group adjusted multimodal scores for the 7 consumed activity types, weighted according to the importance of each activity to the age group. 
i = number of activity types 

Age group adjusted multimodal score 
M_{Age Group} 
This incorporates all the aggregated accessibility scores for all modes of transportation, for each activity. The score for each transport mode is weighted according to its importance to each age group.



Age 
W 
This incorporates all the modeweighted sum of accessible work locations scores for a site and weights each of these scores according to the fraction of the total working population which that age group comprises.

j = number of age groups 

Aggregated accessibility score 
S_{Mode} 
This is the result of summing all the raw accessibility indices for a particular location, using a harmonic series. Each additional opportunity after accessing the first activity, contributes a smaller fraction of the one before it.
Values > 1.00 imply that a particular location has multiple opportunities to access activities from it. There is an aggregated accessibility score for each transportation mode and activity combination.
Note: Places of work are dealt with differently.

n = number of paths


Comprehensive accessibility score 
A 
This incorporates all the age adjusted composite accessibility scores for a site and weights each of these scores according to the fraction of the total population which that age group comprises.

j = number of age groups 

Deterrence parameter 
λ_{mode} 
The parameter that describes the rate of decay of the deterrence function. The value differs with transportation mode and journey purpose. 


Mode‑ 
N_{Age Group} 
This incorporates all sum of accessible work locations scores for all modes of transportation, for the places of work.
The score for each mode is weighted according to its importance to each age group when travelling to work.

k = number of modes considered = 4 

Raw accessibility index 
R 
The percentage of people who would make a trip of at least time (t) to access the activity. Expressed as a number from 0.00 to 1.00. This is calculated from the journey time using a deterrence function. 
R = e^{λ}^{modet}
t = time minutes 

Sum of accessible employment locations 
L_{Mode} 
This is the result of summing all the raw accessibility indices for a particular location for employment locations.
There will be a score for each transportation mode. 
n = number of paths 

Time 
t 
The time in minutes to complete a journey from an origin to an activity. 
