Representing Exception User Classes

[LaurentG-AMD]

Is your feature request related to a problem? Please describe.

Similar to issue #117, there is currently no way to define and communicate a policy that excludes User Classes rater than include them, based on our reading of the User Classes spec.

For instance, creating a no-stopping zone except for buses would require overlaping both a no-stopping zone for every type of vehicles and superimposing a stopping for User Classes='bus' with a higher priority, which departs from the way the regulations are written in Montreal and both makes it more complicated to maintain and to correctly comprehend for local users.

Describe the solution you'd like

We would like

• user_classes_except = true to indicate that a rule does not apply during to the listed user classes

Example : A no stop zone for a bus stop:

{
    'activity': 'no-stopping',
    'user_classes': ['bus'],
    'user_classes_except': true
}

Is this a breaking change

No, not breaking

Impacted Spec

Curbs

Describe alternatives you've considered

As described above it is possible to circumvent the missing exception clause but it requires multiplying the number of policy objects and may make the model harder to maintain and/or comprehend.

Additional context

None

[schnuerle]

Is this close enough to Issue #117 to put this description as a comment there and close this issue? Or do you think this is a different idea?

[LaurentG-AMD]

It's definetly the same idea applied to another section of the spec. They should be treated at the same time.