Misc: What was introduced to our roads in 1967 to make motoring safer?

Questions

Genus of annual & perennial herbs (buttercup) containing about 20 species, grown for their showy flowers?

Genus of plants with more than 150 species, most native to South Africa?

Genus of tropical American flowering annual herbs?

Geological fault zone in California stretching northwest for about 1000 km (about 600 mi), from the Imperial Valley in Southern California to Point Arena on the northern coast & out to sea?

George Kresge Jr.'s spectacular stage name (3 wds)?