A Roadway Safety Sustainable Approach: Modeling for Real-Time Traffic Crash with Limited Data and Its Reliability Verification

Table 1

Variable name and physical meaning.

Variable	Meaning	Variable	Meaning
up_v	The upstream volume	down_o	Average downstream occupancy
up_s	Average speed of upstream traffic volume	down_dif_v	Average absolute value of volume difference between adjacent downstream lanes
up_o	Average upstream occupancy	down_dif_s	Average absolute value of speed difference between adjacent downstream lanes
up_dif_v	Average absolute value of volume difference between adjacent upstream lanes	down_dif_o	Average absolute value of occupancy difference between downstream adjacent lanes
up_dif_s	Average absolute value of speed difference between adjacent upstream lanes	abs_dif_v	Absolute value difference between upstream and downstream volume
up_dif_o	Average absolute value of occupancy difference between upstream adjacent lanes	abs_dif_s	Absolute value of speed difference between upstream and downstream
down_v	The downstream volume	abs_dif_o	Absolute value difference between upstream and downstream occupancy
down_s	Average speed of downstream traffic volume