Modelling the Operating Speed in Segments of Two-Lane Highways from Probe Vehicle Data: A Stochastic Frontier Approach

Table 1

General data on calibration segments.

Variable description	Mean	Standard deviation	Minimum	Maximum
Space mean speed (km/h)	49.2	9.2	21.0	80.0
Bendiness () [degrees/km]	306.7	207.0	39.0	682.3
One-direction paved width (PW) [m]	4.2	0.5	3.4	5.4
Extra lateral clearance (ELC) [m]	1.2	0.4	0.7	2.2
Density of intersections (DI) [No./km]	4.0	1.8	0.5	7.0
Annual average daily traffic (AADT) [vehicles/day]	8,736	5,545	1,750	18,135