Talvez se eu usar o basecamp pra planejar alguma rota eu tenha essa opção
Mas, achei isso aqui:
To locate the Avoidance menu:1
- Touch Tools
- Skip this step on some devices
- Touch Settings
- Skip this step on some devices
- Touch Navigation
- Touch Avoidances
- Touch Enabled for some devices
- Touch the desired Avoidance to enable it
- Touch Save or OK
Repeat the steps above to disable the checked Avoidance.
Available avoidances:
- U-Turns – Avoids calculating routes that require a U-turn
- Highways or Motorways – Avoids highways, interstates, freeways, motorways, and other major routes
- Toll Roads or Tolls and Fees – Avoids toll roads and certain specified congestion zones
- Traffic – Avoids traffic if a quicker route is available
- Requires a Traffic Receiver and subscription (not available on all models)1
- Ferries – Avoids routes that require a ferry crossing
- Carpool Lanes or Car Share Lanes – Avoids lanes designated specifically for carpooling
- Unpaved Roads – avoids unpaved roads (gravel, dirt, etc.)
Assim vc pode mandar o Nuvi evitar "highways".
Veja também a figura anexa. Tem uma opção de "Evitar"