What does a solid line combined with a broken line mean?

Answer 1

In civilian vehicular traffic, broken (or "dotted") lines are used to divide major roadways into lanes. On divided roadways (with a central barrier or turn lane) of 4 lanes or more, broken lines are used between 2 adjacent lanes, when & where it is permitted to change lanes with care. On controlled-access highways (freeways, turnpikes etc), broken lines are also used to separate through- lanes from on and off-ramps. In many jurisdictions, a thicker broken line is used to make that separation distinctive.

On a 2-lane divided roadway (where opposing traffic exists with no physical barrier or turn lane), broken lines are used between the lanes (i.e. centre of the roadway) to identify passing zones. When the centre line is double, the broken line indicates on which side it is permitted to overtake with care. When the centre line is single and broken, it is permitted to overtake with care on both sides.

On roadways with High Occupancy Vehicle lanes ("HOV" lanes), broken lines are used to indicate zones where it is permitted to enter or exit the HOV lane from/to the regular roadway.

The use of solid lines is much more ubiquitous. On multi-lane roadways, they are used to identify the inner & outer road shoulders, or can also be used between lanes in no-passing zones (i.e. construction zones etc). On 2-lane divided highway, solid lines indicate the road shoulder in each direction, and are also used between the 2 lanes (centre of the roadway) to indicate no-passing zones, either in one direction (solid/broken) or in both directions (double or single solid).

At intersections, solid lines are used to indicate stop lines and pedestrian walkways.

On shared roadways (vehicle/bicycle, vehicle/pedestrian), solid lines are used to separate vehicle lanes from the bicycle/pedestrian lanes.

On HOV lane roadways, solid lines are used to separate regular lanes from HOV lanes in areas where entering or exiting the HOV lane is not permitted.

In many jurisdictions, especially those which commonly receive snow in winter, broken lines between lanes of multi-lane roadways are usually white, and the solid lines indicating the inner & outer shoulders are often of different colours, usually yellow for inner & white for outer. Both shoulder lines are often yellow on 2-lane divided roadways.

While police may not necessarilly always ticket motorists who straddle lane/shoulder lines, or who pass when the centre line is solid, such disregard which leads to an accident (including close calls) will most certainly result in charges.

Answer 2

It means that it is a passing zone for the vehicles on the broken line side only.