: Preventing collisions between aircraft, ground vehicles, and personnel.
| Marking Type | Appearance | Meaning (Handbook Extract) | | :--- | :--- | :--- | | | 15cm thick line | Taxiway edge. Do not cross unless authorized. | | Double Solid Yellow | Two parallel lines | Physical barrier; equivalent to a concrete wall. | | Dashed Yellow | 15cm dashes | Aircraft can cross here to enter a taxiway from the apron. | | Solid White | 10-15cm thick | Vehicle lane divider. Do not change lanes. | | Zebra Markings | White stripes across black | Vehicle stop line prior to aircraft pushback path. |