BTS | Table 2 - Accuracy Differences at Different Experimental Levels

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BTS Home > Publications > Journal of Transportation and Statistics > Volume 3 Number 3 > Paper 2

Table 2
Accuracy Differences at Different Experimental Levels

Experiment	Environment	Inventory Element									For all elements	Overall
Experiment	Environment	Lane width	Sign width	Sign lateral placement	Driveway width	Street light spacing	Barrier height	Sign height	Sign support height	Side slope	For all elements	Overall
Experiment 1	Two-lane rural	V_MMS1	*	*	V_MMS1	—	*	*	V_MMS1	*	V_MMS1	M *
	Rural interstate	V_MMS1	VMMSI	M	—	—	*	*	*	*	V_MMS1 *
	Urban	V_MMS1	M	M	V_MMS1	V_MMS1	—	*	*		M *
Experiment 2	Two-lane rural	*	*	*	*	—	*	*	*	*	V_MMS2 *	M *
	Rural interstate	*	*	*	—	—	*	*	*	*	V_MMS2 *
	Urban	*	*	*	*	*	—	*	*	—	M *
Experiment 3	Two-lane rural	*	*	*	—	—	—	*	*	—	M	M *
	Rural interstate	*	*	*	—	—	—	*	*	—	V_MMS3 *
	Urban	*	*	*	—	—	—	*	*		M *
Experiment 4	Two-lane rural	V_MMS4	—	M	M	—	—	—	—	—	M *	M *
	Rural interstate	* †�	—	M	—	—	—	—	—	—	M *
	Urban	V_MMS4	—	M	V_MMS4	V_MMS4	—	—	—	—	M *

Table legend
— = Not tested
* = Not statistically different at the 95% confidence level
M = Data collected by the manual method are statistically more accurate at the 95% confidence level
V_MMS1, V_MMS2, V_MMS3, V_MMS4 = Data collected by the particular method are statistically more accurate at the 95% confidence level
† = Shoulder width measured in place of lane width

Table 2 Accuracy Differences at Different Experimental Levels

Table 2
Accuracy Differences at Different Experimental Levels