What is required for the use of a bicycle lane?

The requirement for the use of a bicycle lane being marked with broken lines is correct because broken lines indicate that this is a separate lane designated for cyclists but allows for some flexibility regarding its use. This marking suggests that vehicles can cross the line into the bicycle lane when necessary, such as when overtaking, but it also emphasizes that drivers should always prioritize the safety of cyclists and look for them before doing so. Proper lane markings, including broken lines, are important in traffic regulation as they help distinguish between different types of road users and promote safe sharing of the road.

The other options do not accurately reflect the rules governing bicycle lane usage. While it's important for cyclists to use the lane whenever possible, they are not legally required to remain in the lane at all times, especially if they need to navigate around obstacles. Additionally, bicycle lanes are specifically allocated to cyclists, and the idea that they can be occupied by vehicles only when no cyclists are present neglects the fundamental purpose of maintaining a safe space for cyclists. Lastly, the assertion that bicycle lanes are open for any vehicle during rush hours undermines their designated use and could lead to dangerous situations for cyclists.