Braking/Stopping Distances
MPH	Ft./Sec.	Braking Distance	Perception-Reaction Distance	Total Stopping Distance
10	14,70	5	22	27
15	22,00	11	33	44
20	29,30	19	44	63
25	36,00	30	55	85
30	44,00	43	66	109
35	51,30	59	77	136
40	58,70	76	88	164
45	66,00	97	99	196
50	73,30	119	110	229
55	80,70	144	121	265
60	88,00	172	132	304
65	95,30	202	143	345
70	102,70	234	154	388
75	110,00	268	165	433
80	117,30	305	176	481
85	124,70	345	187	532
90	132,00	386	198	584
Above information based on full braking, on dry, level asphalt, with an average perception-reaction time of 1.5 seconds. Distances in feet.
http://www.scottsdalelaw.com/shepston/braking.html
1 milha=	1,6097616	km
1 ft=	0,30479997	m