AVOP Runway Incursion Prevention — Questions and Answers
Question 1: What is a runway incursion?
- Any unauthorized or incorrect presence of an aircraft, vehicle, or person on the protected area of a surface designated for landing or takeoff (Correct answer)
- A vehicle crossing a taxiway without clearance from ground control
- An aircraft landing without receiving approach clearance
- A collision between two ground vehicles on the apron
Correct answer: Any unauthorized or incorrect presence of an aircraft, vehicle, or person on the protected area of a surface designated for landing or takeoff
A runway incursion is officially defined as any unauthorized or incorrect presence of an aircraft, vehicle, or person on the protected area designated for takeoff or landing.
Question 2: What do the yellow painted double solid and double dashed lines across a taxiway indicate?
- Runway holding position markings — vehicles must not cross without ATC clearance (Correct answer)
- Taxiway edge markings indicating pavement limits
- A geographic boundary between two airport operational areas
- A vehicle service road crossing zone
Correct answer: Runway holding position markings — vehicles must not cross without ATC clearance
The runway holding position markings (two solid and two dashed yellow lines) indicate the point beyond which vehicles must not proceed without explicit ATC clearance.
Question 3: What does a flashing red light signal from the control tower mean to a vehicle operator on the airside?
- Clear the runway or taxiway — there is danger (Correct answer)
- Stop immediately and wait for further instructions
- Return to your starting position and await clearance
- Proceed to the nearest exit road at reduced speed
Correct answer: Clear the runway or taxiway — there is danger
A flashing red light directed at a vehicle means to clear the runway or taxiway immediately because there is danger.
Question 4: What is the most common contributing factor to runway incursions involving ground vehicles?
- Failure to follow ATC instructions or misunderstanding of clearances (Correct answer)
- Mechanical failure of the vehicle's braking system
- Inadequate airport lighting during night operations
- Incorrect taxi route printed on the airfield map
Correct answer: Failure to follow ATC instructions or misunderstanding of clearances
The most common cause of vehicle-related runway incursions is a failure to correctly follow or understand ATC instructions and clearances.
Question 5: What should a vehicle operator do if an ATC instruction is unclear or not fully understood?
- Request clarification from ATC before proceeding (Correct answer)
- Proceed cautiously based on the best interpretation of the instruction
- Stop in place and wait for another vehicle to follow
- Contact the airside supervisor and proceed when directed
Correct answer: Request clarification from ATC before proceeding
A vehicle operator must always request clarification from ATC before proceeding when any instruction is unclear — guessing is never acceptable near runways.
Question 6: What does a steady red light signal from the ATC tower mean to a ground vehicle operator?
- Stop (Correct answer)
- Proceed with caution
- Clear the area immediately
- Return to the gate
Correct answer: Stop
A steady red light from the control tower is an instruction for the vehicle to stop immediately.
Question 7: At what point must a vehicle operator stop at a runway holding position?
- Before the hold short markings, so the entire vehicle remains on the taxiway side (Correct answer)
- With the front bumper directly over the first solid yellow line
- At a point where the driver can visually confirm no aircraft are on final approach
- Anywhere within 50 feet of the edge of the runway
Correct answer: Before the hold short markings, so the entire vehicle remains on the taxiway side
The entire vehicle must remain on the non-runway side of the holding position markings until ATC clearance is received to cross.
Question 8: What is the purpose of Runway Status Lights (RWSL)?
- To provide an automatic, independent warning system that illuminates red lights when the runway is unsafe to enter or cross (Correct answer)
- To indicate the touchdown zone for arriving aircraft during low-visibility approaches
- To mark the edges of the runway for use by vehicles during nighttime operations
- To signal vehicle operators that they are approaching a wildlife hazard area
Correct answer: To provide an automatic, independent warning system that illuminates red lights when the runway is unsafe to enter or cross
Runway Status Lights are an FAA-developed safety system that automatically displays red in-pavement lights when sensor data determines that the runway is unsafe to enter or cross.
Question 9: During low visibility operations (LVO) on the airside, what is a key additional precaution for vehicle operators?
- Reduce speed, use radio communications more frequently, and confirm position before proceeding across any holding point (Correct answer)
- Avoid all airside operations until visibility improves above 1 mile
- Operate only on vehicle roads and never enter the movement area
- Follow aircraft wingtip lighting to navigate safely around the apron
Correct answer: Reduce speed, use radio communications more frequently, and confirm position before proceeding across any holding point
Low visibility conditions increase the risk of disorientation and incursions, so operators must slow down, communicate more actively with ATC, and verify their position before crossing any runway holding point.
Question 10: What does a flashing white light signal from the ATC tower mean to a vehicle operator in the movement area?
- Return to the starting point on the airport (Correct answer)
- Proceed to the runway threshold
- Exercise extreme caution — an aircraft is on short final
- Clearance is granted to cross the active runway
Correct answer: Return to the starting point on the airport
A flashing white light directed at a vehicle on the airside means to return to the starting point on the airport.
Question 11: What immediate action should a vehicle operator take upon hearing 'STOP STOP STOP' transmitted on the ATC frequency?
- Immediately stop the vehicle in place without question (Correct answer)
- Acknowledge the call and slow to a crawl before stopping at the next hold line
- Stop only if the instruction includes the vehicle's call sign
- Radio ATC to confirm whether the stop call was intended for the vehicle
Correct answer: Immediately stop the vehicle in place without question
An emergency stop call requires all vehicles to stop immediately without hesitation or confirmation — every second matters in preventing a runway incursion collision.
Question 12: What is the recommended action when a vehicle operator becomes unsure of their position on the airfield at night or in reduced visibility?
- Stop the vehicle in a safe place and contact ATC for guidance (Correct answer)
- Retrace the last known route slowly until a recognizable landmark is found
- Switch on all vehicle lights and continue to the destination
- Follow the nearest aircraft until reaching a known area
Correct answer: Stop the vehicle in a safe place and contact ATC for guidance
Stopping in a safe location and contacting ATC for guidance is the safest response to positional uncertainty — continuing without knowing your location greatly increases incursion risk.
Question 13: Which of the following best describes a 'surface incident' as distinguished from a runway incursion?
- An event where a vehicle or aircraft incorrectly enters a taxiway or apron area without authorization but does not involve a runway (Correct answer)
- Any event on the airfield that results in a collision between two vehicles
- A bird strike that occurs during aircraft ground operations
- A vehicle breakdown that blocks a taxiway for more than 10 minutes
Correct answer: An event where a vehicle or aircraft incorrectly enters a taxiway or apron area without authorization but does not involve a runway
A surface incident is an unauthorized or incorrect presence on a taxiway or other non-runway surface area, distinct from a runway incursion which specifically involves the runway protected area.
Question 14: What is the significance of reading back an ATC runway crossing clearance?
- It confirms mutual understanding between ATC and the vehicle operator and allows ATC to correct any error before the crossing (Correct answer)
- It is optional but recommended as a professional courtesy
- It starts an official timer that limits how long the operator has to complete the crossing
- It transfers legal responsibility for the crossing from ATC to the vehicle operator
Correct answer: It confirms mutual understanding between ATC and the vehicle operator and allows ATC to correct any error before the crossing
Reading back ATC clearances, including runway crossing instructions, creates a closed communication loop that allows ATC to catch and correct any misunderstanding before the vehicle enters the runway.
