Immediately after a truck accident in Las Vegas, prioritize safety; move to a secure area and call 911. Seek medical attention even if injuries seem minor, as some symptoms may not appear right away. Document the scene with photos and gather contact information from witnesses and all parties involved. Do not admit fault or make detailed statements to insurance adjusters. It's crucial to report the accident to your insurance company but consider consulting with a truck accident lawyer in Las Vegas before providing a formal statement to ensure your rights are preserved.