Kenneth JohnsonPhone: 651/234-7010 Email: ken.johnson@state.mn.us Completed Projects TitleYearReport #ResearcherIn-Vehicle Work Zone Messages20172017-19 MorrisRumble Stripe: Evaluation of Retroreflectivity and Installation Practices20162016-13 HawkinsExamining the Impact of ASE (Automated Speed Enforcement) in Work Zones on Driver Attention20162016-06 MorrisInvestigate the Effectiveness of Using Bluetooth Low Energy (BLE) Technology to Trigger In-Vehicle Messages at Work Zones20162016-38 LiaoSinusoidal Rumble Strip Design Optimization Study20162016-23 TerhaarDevelopment of a Navigation System Using Smartphone and Bluetooth Technologies to Help the Visually Impaired Navigate Work Zones Safely20142014-12 Liao
