Crossing a double solid white line is generally prohibited, with limited exceptions. Here’s the core guidance: Direct answer
- You must not cross or straddle a double solid white line, unless it is safe and you need to enter adjoining premises or a side road. You may cross the line if it is necessary to pass a stationary vehicle or to overtake a pedal cycle, horse, or road maintenance vehicle if they are traveling at about 10 mph (16 km/h) or less, provided the road is clear. [Highway Code Rule 129] [citation: national driving guidance sources]
Key nuances
- Purpose of the rule: The solid line is used to prevent overtaking where visibility or road geometry makes overtaking dangerous. The restriction applies in the direction of travel with the solid line nearest you. [Highway Code 129] [citation: general road-safety guidance]
- Exceptions cover safety and certain slow-moving or obstructed scenarios:
- Entering adjoining premises or a side road when safe.
- Passing a stationary vehicle if necessary and safe.
- Overtaking a pedal cycle, horse, or road maintenance vehicle traveling at 10 mph or less, if the road is clear. [Rule 129] [citation: driving guidance resources]
Practical tips
- Before crossing a solid line, assess sight lines, oncoming traffic, and whether you can complete the maneuver safely without forcing others to brake abruptly.
- If you’re unsure, err on the side of not crossing and find a safer opportunity or turn at a junction where legal.
- Always adhere to any additional local signs that may impose stricter rules or indicate specific exemptions.
If you’d like, I can tailor this to your country or region’s specific Highway Code or traffic laws and provide the exact rule numbers and wording for your area.
