Configurable path-finding cost of unsafe behaviors (violating intersection rules and making unsafe u-turns) for vehicles. Higher cost restricts vehicles from making these moves.
Configurable path-finding cost of lane changing for vehicles. Higher cost makes vehicles more costly to change lanes during running.
Configurable path-finding cost of simply driving for vehicles. Higher cost effectively reduces the usage of vehicles for citizens (cargo and service vehicles are not affected).
All these function can be turned off.