8:34 & ADO . $ 1 5GUC will 63% 13) Marijuana use will: O a) adversely affect a driver's concentration, judgment, and perceptual skills O b) not affect a driver's ability to safely operate a vehicle O c) make a driver more alert 14) Alcohol affects a driver by: O a) slowing down reaction and impairing perception O b) interfering with concentration and dulling judgment O c) emotions become unstable O d) all of these 15) To avoid crashes, a defensive driver should: O a) ignore the driving of others O b) stay alert and look for trouble spots O c) signal only when meeting other traffic O d) insist on the right of way O