Part-time plaub-log tsav (4WD) thev naus laus zis ua lub luag haujlwm tseem ceeb hauv kev lag luam automotive raws li kev siv ntau yam uas tso cai rau cov tsheb hloov mus rau ntau txoj kev. Zoo li tus neeg tsav tsheb uas paub zoo, nws hloov pauv hloov pauv ntawm hom kev tsav tsheb kom muaj kev nyab xeeb dua thiab yooj yim dua kev tsav tsheb. Qhov system no yog qhov zoo tshaj plaws nyob rau hauv nws lub peev xwm los xaiv txoj kev tsav tsheb tsim nyog raws li qhov xwm txheej tiag tiag, txhim kho lub tsheb hloov mus rau ntau qhov chaw thiab nthuav tawm nws qhov yooj yim.
Ntawm qhov tod tes, txawm hais tias ib nrab hnub 4WD xav tau kev ua haujlwm ntawm tes, qhov kev koom tes ntawm tes no tuaj yeem txhim kho tus neeg tsav tsheb cov kev txawj ua haujlwm thiab ua kom lawv nkag siab thiab tswj lub tsheb. Cov neeg tsav tsheb tuaj yeem xaiv hom tsav tsheb zoo li xaiv cov cuab yeej tsim nyog rau txoj haujlwm. Piv txwv li, lawv tuaj yeem xaiv ob lub log tsav ntawm txoj kev loj thiab hloov mus rau plaub-log tsav ntawm txoj kev nplua thaum los nag lossis daus, ua kom muaj kev nyab xeeb dua thaum tsav tsheb.
Txawm hais tias kev ua haujlwm ntawm phau ntawv yuav xav tau kev siv zog ntxiv, nws kuj tseem ntxiv cov ntsiab lus ntawm kev tsav tsheb kev lom zem thiab kev tshawb nrhiav, ua rau kev tsav tsheb muaj kev cuam tshuam thiab nyuaj.
