What is the maximum speed limit for passenger cars in urban areas unless posted otherwise?

The maximum speed limit for passenger cars in urban areas, unless otherwise posted, is indeed 30 miles per hour. This regulation is designed to promote safety in populated areas where pedestrian traffic and intersections are more common. A limit of 30 mph allows drivers sufficient time to react to sudden changes, such as pedestrians crossing the road or vehicles stopping unexpectedly.

In many jurisdictions, this speed limit reflects the urban environment's needs, balancing the flow of traffic with the safety of all road users. While higher speed limits might be permissible on highways or rural roads where traffic is lighter and visibility is generally better, urban areas prioritize the safety of residents and visitors, necessitating lower maximum speed limits.