Final answer:
The best version of the underlined portions of sentences 3 and 4 is option 3: Completely but they do slow down and roll through the intersection instead.
Step-by-step explanation:
- The best version of the underlined portions of sentences 3 and 4 is option 3: Completely but they do slow down and roll through the intersection instead.
- This version provides a clear and concise statement that vehicles completely slow down before rolling through the intersection.
- It maintains the original meaning of the sentence while improving the clarity of the message.