Question

The pedestrians / must have to be very /
cautious while crossing the road.

tense error and reason?​

Answer 1

No tense error It is correct

Answer 2

The pedestrians are required to be very cautious while crossing the road

EXPLANATION:  

• Generally, the world required means anything that is mandated by an authoritative entity or under law.
• When we say ‘required to be’ it implies to say that somebody needs to do something which implies that there is certain reason why it is essential for that individual to do it, or be it, in a specific set of situations, it is quite general as to what the reason may be.
• In other words, if you say you require something or if something is required, then it means you want it or it is essential officially, or it is compulsory, or otherwise considered vital, indispensable, or crucial in accordance with the rules or for a specific purpose.