The car hit the guardrail but the people are fine.
Tips
grammar
撞到 is the resultative 撞 + 到 ("bump" + "reach") — the 到 marks successful contact. Compare 撞上 (emphasizes the moment of impact, often stronger), 撞见 ("bumped into and saw," used for catching someone in the act).
usage
Common in the idiomatic phrase 撞到人 (ran into someone by chance) — a go-to way to say "I bumped into X today."