Q1. Is it illegal to go too slow on the road or highway? Does the law prescribe a minimum speed for vehicles on roads?
The law does not prescribe any minimum speed for vehicles on the road. However, driving too slow could cause annoyance to other drivers and indirectly encourage overtaking, which of course would increase the probability of accident.
Driving too slow could therefore be a sign of driving “without due care and attention or without reasonable consideration for other persons using the road”, i.e. the feature of careless driving.