¥1988 MUTCD - Requirements of Traffic Control
Devices defined:
" To be effective, a traffic control
device should meet five basic requirements:
1.) Fulfill a
need.
2.) Command
attention.
3.) Convey a
clear, simple meaning.
4.) Command
respect of road users.
5.) Give
adequate time for proper response.
–
[Manual on Uniform Traffic Control
Devices (MUTCD), Part 1 GENERAL PROVISIONS,
SECTION 1A-2, "Requirements of Traffic Control Devices", FHWA, 1988, page 1A-1]