Sau Npe 3.21. Kawg ntawm tsis muaj cheeb tsam overtaking

Kev tshem tawm txoj haujlwm ntawm kos npe 3.20 "Overtaking yog txwv tsis pub".

Yog tias daim paib muaj lub keeb kwm yav dhau xim daj, ces daim paib ntawd yog ib ntus.

Nyob rau kis uas lub ntsiab lus txhais ntawm cov phiajcim ib ntus thiab cov paib ntawm cov paib muaj kev sib cav sib cuam tshuam, cov tsav tsheb yuav tsum ua raws cov phiajcim ib ntus.