Analysis Model of Risk Factors of Urban Bus Operation Based on FTA-CLR

Table 3

Coding and meaning of independent variables.

Symbol	Meaning	Coding and assignment
X1	Age	16–25 years old = 1; 26–35 years old = 2; 36–45 years old = 3; 46–55 years old = 4; 56 years old and above = 5
X2	Driving experience	1–5 years = 1; 5–10 years = 2; 10–15 years = 3; 15–20 years = 4; more than 20 years = 5
X3	Gender	Female = 0; male = 1
X4	Weather	Sunny = 0; nonsunny (rain, snow, fog, overcast, strong wind, etc.) = 1
X5	Road table conditions	Dry = 0; not dry (rain, snow, ice) = 1
X8	Lighting conditions	Daytime = 1; street light at night = 2; No street light at night = 3
X9	Traffic signal mode	Signal control = 0; no signal control = 1
X10	Roadside facilities protection type	Without roadside protection = 0; With roadside protection = 1
X12	Road condition	Road surface is intact = 0; Road surface damage = 1
X13	Driving state	Nonstraight = 0; straight = 1
X14	Intersection or section	Road section = 0; intersection = 1