What is the primary danger of riding over painted road markings (such as zebra crosswalk stripes or lane arrows) in wet weather?

1. Thermoplastic road paint becomes as slippery as wet ice when coated with water, causing sudden loss of tire traction
2. The raised paint layer lifts the tyre clear of the asphalt and unsettles the suspension
3. Painted areas heat up faster and cause the tyre rubber to soften unpredictably
4. Paint hides potholes, which is the only real hazard it presents