Magen Electronic Displays, Toronto, Canada, 416-783-7014, specializing in led signs

Someone traveling in a car at...		Needs this MRLD	Then select a sign with
MPH	Ft./sec.	Ft./sec.	Character Size(in)	Lateral offset(ft)
75 70 65 60 55 50 45 40 35 30 25	110 103 95 88 81 73 66 59 51 44 37	605 565 524 484 444 403 363 323 282 242 202	20 19 17 16 15 13 12 11 9 8 7	0-53 0-50 0-46 0-43 0-39 0-35 0-32 0-28 0-25 0-21 0-18
NOTE: MRLD (Minimum Required Legibility Distance) is the min. distance required for a sign to be readable. This is based on the Legibility Index (LI). In this table an LI=30 is used. This means that for each 1-in of character ht, a sign can be read up to 30-ft. For example, with LI=30, a 10-in character is readable up to 300-ft (30 x 10). Until recently an LI=50 was the "gold standard". However, this is based on someone having 20/20 vision. Today, due to an ageing population, a more realistic value would be LI=30 which is based on someone with 20/40 vision.