An Efficient Methodology for Calibrating Traffic Flow Models Based on Bisection Analysis

Table 1

Weather-related crash statistics (annual averages 1995–2008) [3].

Road weather conditions	Weather-related crash statistics
	Annual rates; (approximately)	Percentages
Wet pavement	1,128,000 crashes	18% of vehicle crashes	75% of weather-related crashes
	507,900 persons injured	17% of crash injuries	81% of weather-related crash injuries
	5,500 persons killed	13% of crash fatalities	77% of weather-related crash fatalities
Rain	707,000 crashes	11% of vehicle crashes	47% of weather-related crashes
	330,200 persons injured	11% of crash injuries	52% of weather-related crash injuries
	3,300 persons killed	8% of crash fatalities	46% of weather-related crash fatalities
Snow/sleet	225,000 crashes	4% of vehicle crashes	15% of weather-related crashes
	70,900 persons injured	2% of crash injuries	11% of weather-related crash injuries
	870 persons killed	2% of crash fatalities	12% of weather-related crash fatalities
Icy pavement	190,100 crashes	3% of vehicle crashes	13% of weather-related crashes
	62,700 persons injured	2% of crash injuries	10% of weather-related crash injuries
	680 persons killed	2% of crash fatalities	10% of weather-related crash fatalities
Snow/slushy pavement	168,300 crashes	3% of vehicle crashes	11% of weather-related crashes
	47,700 persons injured	2% of crash injuries	8% of weather-related crash injuries
	620 persons killed	1% of crash fatalities	9% of weather-related crash fatalities
Fog	38,000 crashes	1% of vehicle crashes	3% of weather-related crashes
	15,600 persons injured	1% of crash injuries	2% of weather-related crash injuries
	600 persons killed	1% of crash fatalities	8% of weather-related crash fatalities
Weather-related	1,511,200 crashes	24% of vehicle crashes
	629,300 persons injured	21% of crash injuries
	7,130 persons killed	17% of crash fatalities