Table 1:

Keywords or search terms used in articles searching

Databases	Group	Keywords/search terms
Google Scholar, Scopus, PubMed, Science Direct, IEEE, SAGE	Vehicle	Motorcycle, motorbike, Moped, powered two-wheeler, PTW, two-wheeled vehicles
	User	Motorcyclists, riders, bikers
	Condition/Issue/Conspicuity aid	Conspicuity, visibility, reflective, colour, identification, head-lamp, headlight, taillamp, taillight, lamp, light, daytime running light (DRL), daytime running headlight (DRH), daytime running taillight (DRT), brake light, attire, cloth, helmet