Since cellphones with the WAZE app installed did not yet exist in 1906, motorists of the day resorted to using confetti flung across the roadway to warn other drivers of a “police trap” ahead.
Since speeds were limited by the capabilities of your horseless carriage, I have to assume that such traps involved general police harassment, and perhaps a nightstick on the noggin. One would be well advised to purchase the proffered tickets to the Policeman’s Widows and Orphans Ball.
