Originally Posted by
Happy Feet
In Canada I would not use the "avoid Hwy's" feature. This tends to send cyclists on wildly circuitous routes that can add hundreds of Km's of sketchy roads with little or no shoulders. A perfect example is Hope to Revelstoke. Avoid Hwy's sends you up either the Fraser Canyon or the Crowsnest (both of which are Hwy's) and which have worse shoulders than the Coquihalla and adds at least 100km's to the route.
As you liikely would not want to use it for NW US roads where using the interstate is the norm. You have to use your head too.