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The technique that offers the largest margin of safety when designing a large parking lot that connects to a busy arterial roadway is the design with separate entrances and exits that favor right-hand turns. This approach minimizes conflicts and potential hazards by allowing vehicles to merge into traffic more efficiently and safely.

By favoring right-hand turns, vehicles can enter and exit the parking lot without crossing oncoming traffic, which significantly reduces the risk of collisions. This is especially important in high-traffic areas where the likelihood of accidents increases due to the volume of vehicles and their speeds. Right-hand turns allow for more natural traffic flow, as they align with the typical driving behavior of turning right when leaving a parking facility onto a roadway.

Additionally, separate entrances and exits help to streamline traffic, preventing congestion that can arise from vehicles backing up while waiting to turn left or while navigating a single entrance, which could potentially lead to misunderstandings and more complex traffic situations. This separation enhances the overall flow of traffic and provides a safer environment for both the parking lot users and the arterial roadway traffic.

The other techniques, while having their own merits, may introduce more complexities and potential hazards that can compromise safety in high-traffic conditions. For example, a single entrance with a traffic signal may create delays or