Under what condition is it legal to cross a double solid yellow line?

Answer: B — When you are making a left turn into a business or home driveway

Crossing a double solid yellow line is typically illegal; however, an exception exists when making a left turn into a business or home driveway. This is because the law allows for some flexibility to ensure that drivers can safely enter or exit properties. When you're approaching a driveway where a left turn is required, the double solid line is effectively disregarded for that specific maneuver, as the objective is to provide safe access to the property without requiring additional turns or navigating around barriers. This regulation prioritizes safety and provides a necessary means for drivers to enter or exit their residences or businesses, while other scenarios, like passing another vehicle or making U-turns across a double solid line, are not permitted due to safety concerns.