What are marked on highways by a diamond shape in the center of the lane and may be special lanes separated by a barrier?

The question pertains to the identification of specific lanes on highways indicated by a diamond shape in the center. This diamond symbol signifies high occupancy vehicle (HOV) lanes, which are designed to promote carpooling and reduce traffic congestion. The primary purpose of HOV lanes is to encourage the use of vehicles with multiple passengers, thereby increasing the efficiency of road usage and lowering the environmental impact.

HOV lanes are often separated from regular traffic lanes by physical barriers or distinct markings, making them clear for drivers to identify. The diamond symbol is widely recognized as a marker for these lanes, alerting drivers of the requirement for more than one occupant in the vehicle to utilize these lanes.

Other lane types mentioned have different designations and purposes. Motorcycle lanes typically do not use diamond symbols and are designed for motorcycle safety. Bicycle lanes are marked with different signage that highlights their usage for cyclists. Public transport lanes may use different symbols or signage to indicate their use for buses or other forms of public transportation, rather than specific markings like diamonds in the lane.