Which of the following is true about driving over bridges?

Answer: A — They can be crowded and often have limited visibility.

Driving over bridges can present unique challenges. The correct answer highlights that bridges can indeed be crowded and often feature limited visibility. This is important for drivers to keep in mind, as the configuration of a bridge can restrict sightlines and impede a driver's ability to assess traffic conditions effectively. Factors such as the elevation of the bridge, surrounding scenery, and the design of exit and entry points can create situations where visibility may be reduced. Additionally, during periods of heavy traffic, bridges may become congested, necessitating additional caution from drivers to ensure safe navigation. The other options do not accurately reflect the typical conditions associated with bridge driving. Not all bridges have a shoulder for emergencies, which is critical for drivers to understand as it affects how they should respond in a roadside emergency. Bridges may have multiple lanes, but this is not universal, and many are single or two-lane structures. Finally, while some bridges accommodate high-speed travel, they are not exclusively designed for this purpose; many bridges prioritize safety and structural integrity over speed. Understanding these aspects aids drivers in navigating bridges safely and responsibly.