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A comment on Victoria follows South Australia and imposes electric car road tax. Parent comment
Possible formula to account for all the variables:
annual tax = F * (A + [BC{D^E} ] )
A = constant for non-loading based degradation (frost heave, slope maintenance). Base tax
B = constant to scale the following terms
C = distance driven in km
D = axial weight
E = exponent to account for non-linear relationship of axial weight to road degradation
F = adjustment for usage (could adjust for anything - user type, income class, vehicle class, etc etc)
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Possible formula to account for all the variables:
annual tax = F * (A + [BC{D^E} ] )
A = constant for non-loading based degradation (frost heave, slope maintenance). Base tax
B = constant to scale the following terms
C = distance driven in km
D = axial weight
E = exponent to account for non-linear relationship of axial weight to road degradation
F = adjustment for usage (could adjust for anything - user type, income class, vehicle class, etc etc)