if there are sidewalks along that 3-4 lane area, would switching to "walking" enable the route?
I do not like how most maps put cycling out of the way, by a long shot when the shorter option usually is not any more or less risky/safe... yet it can be a difference of punctures & 30 minutes going the "suggested" route... It's different when the effort to propel forward is done by a machine not a pair of legs.
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-Oh Hey!