Couldn't you do a single tone (say frequency of 500Hz) that plays for 3 seconds. Then its up to the person entering to have to listen for that frequency. Or perhaps an IR source that flashes at a specific rate (say 1Hz until the start, then 10Hz for go. or just on for wait, off for go). Then the vehicle would just have to have a sensor aligned with your source as part of the vehicle. Could it be optional just like automated landing would be? I do agree, it would be a huge pain, but it would still be pretty slick to see someone who simply places something on the line and then picks it up after its completed it circuit!
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