You could speculate that it is important for motorists to keep up to date with traffic laws and driving techniques to maximize

safety (on the road)

Traffic laws and defensive driving techniques are constantly updated. Drivers must learn the updates to increase safety on the road for all motorists ( and even pedestrians). The motorists must also get updated with changes on routes and/or road signs, speed limits etc.

definition was not one of the four methods

harlem's  cotton club boasted the talents of duke ellington. singers such as bessie smith and billie holiday popularized blues and jazz vocals. jelly roll morton and louis armstrong drew huge audiences as white americans as well as african americans caught jazz fever.