TTCa metal frame fixed on top of a car and used for carrying bags, cases etc 〔汽车的〕车顶行李架SYN American English luggage rack
Examples from the Corpus
roof-rack• Bulkier things like sofas can be delivered or whisked away on a rented roof-rack.• Ten minutes seemed to make little difference, with the jerry-cans still discernible on the roof-rack.