European Transport Research Review

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Table 4 Results of the SAS questionnaire

From: The Virtual Driving Coach - design and preliminary testing of a predictive eco-driving assistance system for heavy-duty vehicles

		Usefulness scale					Satisfying scale
	n	mean	median	SD	min	max	mean	median	SD	min	max
Before	20	0.68	0.90	1.00	−2.00	2.00	−0.11	−0.12	0.95	−2.00	1.75
After	20	0.94	1.30	0.98	−1.60	2.00	0.49	0.88	1.17	−2.00	2.00

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