| **Color and Type of Signal** | **Movement of Vehicles, Equipment and Personnel** | **Aircraft on the Ground** | **Aircraft in Flight** | |:-------------------------------------------------------------:| ------------------------------------------------- | ----------------------------------- | ---------------------------------------------------------------------- | | Steady green<br><span style="color:green">\_\_\_\_</span> | Cleared to cross, proceed or go | Cleared for takeoff | Cleared to land | | Flashing green<br><span style="color:green">\_ \_ \_</span> | Not applicable | Cleared for taxi | Return for landing (to be followed by steady green at the proper time) | | Steady red<br><span style="color:red">\_\_\_\_</span> | STOP | STOP | Give way to other aircraft and continue circling | | Flashing red<br><span style="color:red">\_ \_ \_</span> | Clear the taxiway/runway | Taxi clear of the runway in use | Airport unsafe, do not land | | Flashing white<br><span style="color:white">\_ \_ \_</span> | Return to starting point on airport | Return to starting point on airport | Not applicable | | Alternating red and green<br><span style="color:red">\_ </span><span style="color:green">\_ </span><span style="color:red">\_</span> | Exercise extreme caution | Exercise extreme caution | Exercise extreme caution | ***Source***: [AIM 4-3](https://www.faa.gov/air_traffic/publications/atpubs/aim_html/chap4_section_3.html), [[FAR 91.125 ATC Light Signals]]