1. The sentence should be: "What should you do to ensure traffic safety?" 
2. The sentence should be: "As a road user, what are the things you should not do to ensure traffic safety?" 
3. The sentence is grammatically correct, but it contains a spelling error. "Shool" should be "school." The sentence could be rewritten as "How do you travel to school every day?" 
4. The sentence is grammatically correct. However, it contains a spelling error. "Shool" should be "school." The sentence could be rewritten as "How far is it from your house to school?"