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C H A P T E R 18 Signing General Principles for Sign Legends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18-2 Sign Design to Improve Legibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18-4 Conspicuity of Diamond Warning Signs under Nighttime Conditions . . . . . . . . . . . . . . . . .18-6 Driver Comprehension of Signs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18-8 Complexity of Sign Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18-10 18-1