Three lane highway in Calgary:
Express Lane: Toll-managed, RFD card membership required
Carpool Lane: Cars with 2 or more occupants (not sure how to manage, but police supervision; ticket if used inappropriately)
Regular Lane: Everyone else
Also, lanes should be color-coded, road reflectors installed (as part of color coordination), and signage should be solar powered
As Muta alluded to, would love to see out-of-towners have to pay a fee to use our City of Calgary roads on a daily basis, but that would be hard to govern.