Driver information systems have been advocated that can warn drivers in real time about obstructions. These can make it possible for drivers to choose detours and avoid blockages. Why is this not a good idea for fixed-route transit systems? OA. A bus driver forced to take a new route can easily get lost. OB. Buses will be too big to fit on some detour routes. OC. Adding more buses to the detour traffic will affect signal timing. O D. People waiting at bus stops along the normal route will not be serviced by the detoured bus