Alberta Motor Association (AMA) Learner’s Practice Exam

The correct answer highlights that diamond marked lanes are typically designated for specific vehicles, most commonly for high-occupancy vehicle (HOV) use. These lanes are intended to promote carpooling and efficient transportation to reduce traffic congestion.

Non-specific vehicles like bicycles and taxis may not be allowed in these lanes as they are not designed to accommodate them. Taxis usually have specific regulations regarding lane usage, particularly when they are intended for high-occupancy travel.

The other options do not accurately capture the full range of vehicles restricted from these lanes. Heavy trucks are generally not allowed in diamond marked lanes due to size and weight considerations, but it's not limited exclusively to them. Similarly, while passenger vehicles are often allowed in HOV lanes if they meet the occupancy requirements, they do not fall under the category of vehicles restricted from using diamond-marked lanes altogether. This underscores the nuanced regulations governing lane usage that prioritize specific vehicle types based on established traffic policies and goals.