“…There were four instances of auditory-visual alert combination [118,128,132,139], and one instance of visual-tactile feedback combination [127]. Standalone auditory alerts were implemented by five studies [111,112,131,136,137], standalone visual communication was applied in another five studies [116,119,130,133,134], while standalone tactile feedback was mentioned in four studies [114,120,123,135]. Meanwhile, eight studies integrated auditory and tactile alerts to communicate safety information to the personnel [113,115,117,121,124,125,129,138].…”