ADOT is once again holding its Safety Message Contest. ADOT will display the quirky traffic safety messages as part of an effort to encourage drivers to change their actions behind the wheel. More than 90 percent of vehicle crashes are caused by driver decisions, such as speeding, driving aggressively, distracted or impaired. According to preliminary data, more than 1,000 people were killed in traffic collisions last year in Arizona. Messages can be submitted at azdot.gov/signcontest through Monday. In the past two contests, ADOT received a combined 9,000 entries. After entries have been submitted, ADOT will select 15 finalists. In May, the public will vote for their favorites and the two messages that receive the most votes will appear on overhead signs above Arizona state highways.