1. Corrugated beam steel guardrail. Daim ntawv thov dav tshaj plaws, qib kev nyab xeeb siab, kev saib xyuas yooj yim, tus nqi nruab nrab, feem ntau siv rau sab ntawm txoj kev loj, txoj kev hauv nruab nrab, thiab txoj kev ramp.
2. Square raj crossbeam guardrail. Feem ntau yog siv rau kev sib cais hauv nruab nrab ntawm cov txuas hniav thiab cov daus npog hauv cheeb tsam sab qaum teb, nrog kev nyab xeeb siab, kev saib xyuas yooj yim, thiab tus nqi siab, feem ntau siv nyob rau sab qaum teb.
3. Yooj yim guardrail. Feem ntau siv rau hauv qhov chaw zoo nkauj, nrog rau theem kev nyab xeeb me ntsis, kev saib xyuas nyuaj, thiab tus nqi nruab nrab, feem ntau yog siv rau ntawm txoj kev.
4. Pob zeb guardrail. Feem ntau yog siv rau kev sib cais hauv nruab nrab hauv cov chaw pabcuam thiab cov ramps, nrog rau theem kev nyab xeeb me ntsis, kev saib xyuas nyuaj, thiab tus nqi qis dua.