What is the number of cats eyes on double white solid lines?

The number of cat's eyes, or reflective road studs, on double white solid lines is typically twice as many as those found on hazard lines. Double white lines are often used to indicate that overtaking is prohibited in both directions, ensuring that drivers stay within their lane for safety. Since these lines are meant to provide clearer guidance due to their significance in traffic regulations, they are equipped with more cat's eyes to enhance visibility, particularly in low-light conditions.

On hazard lines, which indicate warning or caution for specific areas such as roadworks or curves, the use of reflective studs is limited to maintain a specific visual cue without overwhelming drivers. Therefore, having double the amount on solid lines serves to reinforce their importance and the need for drivers to pay close attention to these markers. This functionality of the cat's eyes is crucial for maintaining road safety and reducing the risk of accidents in areas where careful driving is essential.