Nomograms for selecting a message

The following nomograms are used to determine letter height, number of lanes versus number of bits of

information. These nomograms include a further factor that accounts for reading time and multiple glances to

the sign to fully understand its message.

Assumptions:

Lane width = 3.2m

Sign offset from kerb = 1.5m

Speed = 50km/h

FIGURE 1: LETTER HEIGHT FOR GROUND-MOUNTED SIGNS

FIGURE 2: LETTER HEIGHT FOR OVERHEAD-MOUNTED SIGNS

1 lane

2 lane

3 lane

4 lane

5 lane

1 2 3 4 5 6 7 8 9 10 11 12Information Bits

300-400200-300100-2000-100

5

6

7

8

9

1 2 3 4 5 6 7 8 9 10 11 12

Dis

tan

ceab

ove

road

(m)

Information Bits

300-400

200-300100-200

0-100