Why are right hand wheel drive vehicles allowed on our roads?

There is currently no prohibition against importing or operating a right hand drive vehicle on British Columbia highways. ICBC is studying the crash potential of these vehicles and reports do indicate that there is a higher crash risk. References:

The Safety of Right Hand Drive Vehicles in British Columbia
Vehicle Inspection and Standards Bulletin
Mechanical or Electrical Signal Devices Required on Right Hand Drive Vehicles - Section 172(2) MVA