"Regulatory and warning signs should be used conservatively because these signs, if used to excess, tend to lose their effectiveness." -- Manual on Uniform Tra

"Regulatory and warning signs should be used conservatively because these signs, if used to excess, tend to lose their effectiveness." -- Manual on Uniform Traffic Control Devices, 2009 edition, section 2A.04, paragraph 01 Replace 'signs' with anything--no one's patience/attention will hold up in the face of a constant barrage of information.