What mechanism did Leslie Hepworth Haseltine suggest for his automatic traffic control system patent in 1928?

Answer

Detectors embedded in the pavement

Haseltine's patent suggested detectors embedded in the pavement that would relay information to a central control box to adjust signal timing.

What mechanism did Leslie Hepworth Haseltine suggest for his automatic traffic control system patent in 1928?
inventiontechnologytransportautonomyintersection