Table 1.

System A speed limits and speed settings by Malaterre and Saad (1984)

Speed limit	System use imposed			System use on voluntary basis
	Correct speed	Excessive speed	Non-use	Correct speed	Excessive speed	Non-use
45	50%	8%	42%		7%	93%
60	72%		25%	11%	32%	57%
80	81%	2%	17%	7%	35%	58%
90	96%		4%	42%	33%	29%