Final answer:
When traveling below 40 mph on a limited access highway, you should keep to the right lane to allow faster traffic to pass and maintain road safety.
Step-by-step explanation:
When traveling below 40 miles per hour (mph) on a limited access highway, the correct practice is to keep to the right lane. This is to allow faster-moving traffic to pass on the left. It's important for safety and keeping traffic flowing smoothly that slower traffic keeps to the right. Exceeding the speed limit is illegal and unsafe, while driving at any speed does not take into consideration the rules of the road or the safety of others.
Additionally, in towns and cities, where the speed limit might be around 60 km/h, it's important to adhere strictly to speed regulations to avoid endangering pedestrians who may be crossing the road.