I couldn't retrieve the actual article — both the provided text and a direct fetch only returned the site's Cloudflare "Just a moment…" verification page (HTTP 403), not the real content. I don't have enough information to write an accurate summary.

Based only on the headline, here's what can be said, but please note this is not a full summary since the article body is inaccessible:

SUMMARY:
The M18 southbound carriageway between Hatfield and Doncaster has been closed following a multi-vehicle collision, according to a report from The Star. Closures of this kind typically cause significant traffic disruption on a major route, though full details of the incident are not available from the source page.