Cov cai dav dav rau kev siv cov duab kos npe

ib. Daim duab peb sab sib npaug: siv rau cov cim ceeb toom;
b. Lub voj voog: siv rau kev txwv tsis pub thiab cov cim qhia;
c. Inverted equilateral daim duab peb sab: siv rau "slow down and give way" txwv tsis pub kos npe;
d. Octagon: siv rau "nres thiab tawm" cov cim txwv;
e. Hla: siv rau "Railway Level Crossing Cross Symbol" ceeb toom kos npe:
f. Square: siv rau cov paib qhia, qee qhov ceeb toom, txwv tsis pub thiab qhia cov paib, cov paib ncig xyuas thaj chaw, cov paib pab cuam, thiab cov teeb ceeb toom.