Ukukhanya okuphezulu okuthe xaxa kufakwe engxenyeni engenhla yesemuva yemoto, ukuze imoto yokushayela ngemuva kulula ukuthola ingaphambili lengozi yemoto, ukuvikela ingozi ende. Ngoba imoto esejwayelekile isivele inamalambu amabili e-brake afakwe ekugcineni kwemoto engemuva, eyodwa kwesokunxele nelungelo elilodwa.

Ngakho-ke ukukhanya okuphakeme kwe-brake kubizwa nangokukhanya kwe-brake yesithathu, ukukhanya okuphezulu okumnandi, ukukhanya kwesithathu kwe-brake. Ukukhanya okuphakeme okuphezulu kusetshenziselwa ukuxwayisa imoto ngemuva, ukuze kugwenywe ukushayisana kwangemuva.

Izimoto ezingenazibani eziphakeme zokubhuka, ikakhulukazi izimoto nezimoto ezincane ezinama-chassis aphansi lapho kukhanya ngenxa yokukhanya okuphansi kokukhanya kwangemuva, okuvame ukungabi namabhasi amaloli, ikakhulukazi amabhasi anama-chassis aphezulu kwesinye isikhathi kuba nzima ukubona kahle. Ngakho-ke, ingozi efihlekile yokushayisana kwangemuva kukhulu. [1]

Inani elikhulu lemiphumela yocwaningo libonisa ukuthi ukukhanya okuphezulu kwe-brake kungavimbela ngempumelelo futhi kunciphise ukwenzeka kokushayisana kwangemuva. Ngakho-ke, amalambu aphukile aphezulu asetshenziswa kabanzi emazweni amaningi athuthukile. Isibonelo, e-United States, ngokusho kwemithethonqubo, zonke izimoto ezisanda kuthengiswa kufanele zifakwe amalambu aphezulu okuqhakaza kusukela ngo-1986. Wonke amaloli akhanyayo athengiswa kusukela ngonyaka we-1994 kumele abe namalambu wokubopha aphezulu