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It refers to a vehicle striking a cyclist heading in the same direction by turning right into the cyclist. To prevent such a crash, this work presents CycleGuard, an acoustic-based collision detection system using smartphones. It is composed of a cheap commercial off-the-shelf (COTS) portable speaker that emits imperceptible high-frequency acoustic signals and a smartphone for reflected signal reception and analysis. Since received acoustic signals bear rich information of their reflecting objects, CycleGuard applies advanced acoustic ranging techniques to extract those information for traffic analysis. Cyclists are alerted if any pending right hook crashes are detected. Real-time alerts ensure that cyclists have sufficient time to react, apply brakes, and eventually avoid the hazard. To validate the efficacy of CycleGuard, we implement a proof-of-concept prototype and carry out extensive in-field experiments under a broad spectrum of settings. Results show that CycleGuard achieves up to 95% accuracy in preventing right hook crashes and is robust to various scenarios. It is also energy-friendly to run on battery-powered smartphones.<\/jats:p>","DOI":"10.1145\/3494992","type":"journal-article","created":{"date-parts":[[2021,12,30]],"date-time":"2021-12-30T17:40:33Z","timestamp":1640886033000},"page":"1-30","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":19,"title":["CycleGuard"],"prefix":"10.1145","volume":"5","author":[{"given":"Wenqiang","family":"Jin","sequence":"first","affiliation":[{"name":"Hunan University, Changsha, Hunan, China"}]},{"given":"Srinivasan","family":"Murali","sequence":"additional","affiliation":[{"name":"The University of Texas at Arlington, Arlington, TX, USA"}]},{"given":"Youngtak","family":"Cho","sequence":"additional","affiliation":[{"name":"The University of Texas at Arlington, Arlington, TX, USA"}]},{"given":"Huadi","family":"Zhu","sequence":"additional","affiliation":[{"name":"The University of Texas at Arlington, Arlington, TX, USA"}]},{"given":"Tianhao","family":"Li","sequence":"additional","affiliation":[{"name":"The University of Texas at Arlington, Arlington, TX, USA"}]},{"given":"Rachael Thompson","family":"Panik","sequence":"additional","affiliation":[{"name":"Georgia Institute of Technology, Atlanta, GA, USA"}]},{"given":"Anika","family":"Rimu","sequence":"additional","affiliation":[{"name":"The University of Texas at Arlington, Arlington, TX, USA"}]},{"given":"Shuchisnigdha","family":"Deb","sequence":"additional","affiliation":[{"name":"The University of Texas at Arlington, Arlington, TX, USA"}]},{"given":"Kari","family":"Watkins","sequence":"additional","affiliation":[{"name":"Georgia Institute of Technology, Atlanta, GA, USA"}]},{"given":"Xu","family":"Yuan","sequence":"additional","affiliation":[{"name":"University of Louisiana at Lafayette, Lafayette, LA, USA"}]},{"given":"Ming","family":"Li","sequence":"additional","affiliation":[{"name":"The University of Texas at Arlington, Arlington, TX, USA"}]}],"member":"320","published-online":{"date-parts":[[2021,12,30]]},"reference":[{"key":"e_1_2_2_1_1","unstructured":"Audi AG. 2021. 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