The maximum speed allowed on urban interstate highways is _____ miles per hour.

The maximum speed allowed on urban interstate highways is typically 55 miles per hour. This limit is set to promote safety in areas with higher population density, where traffic is heavier and there are more potential hazards, such as pedestrians, cyclists, and intersections. In urban areas, the combination of increased traffic volume and the presence of other road users makes it important to limit speed to reduce the risk of accidents. Speed limits in these areas are designed to balance the need for efficient transport with the safety of all road users.

In contrast, other options such as 45, 50, and 60 miles per hour may be applicable in different contexts or locations, such as rural highways or specific road conditions, but they do not reflect the standard maximum for urban interstate highways, which is universally recognized as 55 miles per hour. This standard also aligns with many state regulations, promoting uniformity and safety on urban roads across different states.