Research Article

A Clustering Approach to Identify High-Risk Taxi Drivers Based on Self-Reported Driving Behavior

Table 4

PCA and reliability indices for the DBQ items.

DBQ itemsComponents
12345

Misread the signs and exit from a roundabout on the wrong road (LAP6)0.777
No clear recollection of the road along which you have just traveled (LAP7)0.756
Switch on one thing when you meant to switch on something else (LAP5)0.727
Fail to check your rear-view mirror before pulling out, changing lanes, etc. (ERR5)0.715
Attempt to drive away from the traffic lights in third gear (LAP1)0.391
Wake up to find yourself on a wrong but more familiar destination (LAP4)0.355
Forget when you left your car in the car park (LAP3)0.339
Fail to notice that pedestrians are crossing when turning into a side street from a main road (ERR1)0.798
Hit something when reversing that you have not previously seen (LAP8)0.422
When turning left, nearly hit a bicycle rider who has come up on your left (ERR6)0.404
Attempt to overtake someone that you had not noticed was signaling a right turn (ERR2)0.381
Overtake a slow driver on the inside (OV5)0.791
Become angry at another driver and chase them with the intention of showing them how angry you are (AV5)0.763
Enter an intersection knowing that the traffic lights have changed against you (OV2)0.394
Disregard the speed limit on a freeway or rural highway (OV3)0.377
Disregard the speed limit on a residential road (OV4)0.358
Underestimate the speed of an oncoming vehicle when overtaking (ERR8)0.780
Brake too quickly on a slippery road (ERR7)0.362
Queuing to turn left onto a main road, you pay such close attention to the traffic on the main road that you almost hit the car in front (ERR3)0.344
Pull out of an intersection so far you force your way into the traffic (AV3)0.844
Race away from the traffic lights to beat another driver (AV6)0.711
Get angry at a certain type of driver and express your anger any way you can (AV4)0.384
Drive so close to the car in front that it would be difficult to stop in an emergency (OV1)0.381
Sound your horn to indicate your annoyance at another road user (AV1)0.332