What does a solid double white line mean?

A solid double white line indicates that no overtaking is allowed. This road marking is used to enhance safety by preventing vehicles from crossing into oncoming traffic, which can be especially dangerous in areas where visibility is limited or where there are curves in the road. The presence of a solid double line signifies that it's illegal to change lanes or overtake another vehicle in that section, reinforcing the rule that maintains a clear and safe driving environment. This marking is particularly important in high-traffic areas or along roads where the risk of accidents is greater, thus promoting smoother traffic flow and reducing the likelihood of collisions.