What did early solutions often lack that the black and white stripes effectively provided?

Answer

Immediate, arresting visibility to halt fast-moving traffic

The earlier methods, like single lines or signs, were insufficient because they lacked the immediate, arresting visibility needed to reliably command attention from drivers who were still adjusting to the motor age road rules.

What did early solutions often lack that the black and white stripes effectively provided?
inventordesigntraffic controlroad safetyzebra crossing