Question

test your knowledge
you are the driver of vehicle x in the expressway merge diagram on
the left. check the step of the ipde process that best describes the
action(s) you are taking in each statement below.

1. vehicle a is approaching from the entrance

ramp.

1. vehicle a may merge into your path of travel.
2. there is no vehicle behind vehicle c.
3. vehicle b is maintaining speed, while vehicle c

is accelerating.

1. you are too close to vehicle b.
2. you will slow and change lanes so vehicle a

can merge.

1. you check the mirrors and slow.
2. you will need to signal before changing lanes.
3. you signal, check traffic, and move into the

center lane.

1. you cancel your signal.

Explanation:

The IPDE Process stands for Identify, Predict, Decide, Execute:

• Identify (I): Notice specific objects, conditions, or hazards in the driving environment.
• Predict (P): Judge what might happen based on the identified information.
• Decide (D): Choose a specific action to take in response to the prediction/hazard.
• Execute (E): Carry out the decided action.

1. Vehicle A is approaching from the entrance ramp: This is noticing a vehicle in the environment → Identify.
2. Vehicle A may merge into your path of travel: This is judging what the vehicle might do → Predict.
3. There is no vehicle behind vehicle C: This is noticing a condition in the environment → Identify.
4. Vehicle B is maintaining speed, while vehicle C is accelerating: This is noticing vehicle behaviors in the environment → Identify.
5. You are too close to vehicle B: This is noticing a hazard/condition in the environment → Identify.
6. You will slow and change lanes so vehicle A can merge: This is choosing a specific action to take → Decide.
7. You check the mirrors and slow: This is carrying out the decided action → Execute.
8. You will need to signal before changing lanes: This is choosing a required action to take → Decide.
9. You signal, check traffic, and move into the center lane: This is carrying out the decided lane change → Execute.
10. You cancel your signal: This is carrying out the final step of the lane change action → Execute.

Answer:

	I	P	D	E
2		X
3	X
4	X
5	X
6			X
7				X
8			X
9				X
10				X