Characteristics of Laser Backscattering Intensity to Detect Frozen and Wet Surfaces on Roads

Table 2

Statistics of laser backscattering intensity for surface types at the 30 m distance.

Surface Type	Vegetation	Dry Asphalt	Wet Asphalt	Ice (Sidewall)
No. of sample points	208	296	195	223
Mean	328.86	208.09	143.19	157.51
Standard deviation	95.51	7.09	16.94	70.15
Minimum	196	190	93	77
Maximum	634	236	176	852