The Role of Journey Purpose in Road Traffic Injuries: A Bayesian Network Approach

Table 1

Number of cases and a priori probability of the severity of the injury based on behavior variables. Processed by the authors.

Variables	No. cases	KSI risk	Comments
Type of vehicle
Car	47928	0.038	Car, van, all-terrain
Bike	3203	0.146	Bikes
Motorcycle	9617	0.213	Moped, motorcycle <125 cc, motorcycle >125 cc
Bus	939	0.025	Minibus (up to 17 passengers), bus, articulated bus
Truck	3994	0.047	Rigid truck, truck, articulated, articulated vehicle
Others	572	0.120
Zone
Road	39235	0.090	Road, secondary road
Crossing	701	0.102	Crossing through roads
Urban area	26166	0.039	Street
Highway	116	0.083	Highway/motorway
Type of trip
“In itinere”	13406	0.065	“in itinere,” student to student center, transporter minors to school
On bussiness	7893	0.058	Like drive any bus, taxi, transport goods, others
Leisure	28855	0.073	Leisure and entertainment, particular sport activities
Others	16099	0.075
Distance
Local	42138	0.050	Less than 50 km
Medium	8269	0.082	Between 50 and 200 km
Long	3206	0.077	More than 200 km
Unknown	12640	0.127
Age
<18	904	0.181
18–24	8124	0.073
25–60	49027	0.069
>60	7920	0.062
Unknown	278	0.074
Gender
Men	49109	0.076
Women	17082	0.052
Unknown	62	0.087
Seat belt
Yes	44626	0.038	Seat belt fastened
No	6584	0.199	Seat belt not fastened
Unknown	15043	0.106
Helmet
Yes	11123	0.204	Wearing a helmet or it was supposedly expelled
No	964	0.130	Not wearing a helmet
Unknown	54166	0.041
Variables	No. cases	K/SI risk	Comments in English
Speed
No infraction	44338	0.048	Adequate speed
Inadequate	6196	0.120	Inadequate speed for road conditions
Exceeding	693	0.190	Exceeding the established speed
Slow	49	0.068	Slow march / hindering circulation
Unknown	14977	0.107
Distraction
No	27474	0.070	No factor is appreciated
Yes	5205	0.069	Use of mobile phone, use of hand-free devices, use of GPS devices, radio or music on, watching DVD, or video device, wearing headphones, smoking, simultaneous driving activities (eating, drinking, finding objects…,), interacting with other occupants, distracted by a previous accident, looking at the environment (landscape, advertising, signs…,), being lost in thought or absent minded, sleep, fatigue, sudden illness, indisposition.
Unknown	33574	0.070
Errors
No	29773	0.069	There are no errors
Yes	20038	0.060	Failing to see a road sign, failing to see a vehicle/pedestrian/obstacle, not understanding a road sign or contusing it, hesitation or delay in making a decision, incorrect execution of a maneuvers or inadequate maneuver, forgetting to signalise (with the vehicle indicators or lights…)
Unknown	16438	0.084