pit_lane.ai files for ks_brands_hatch GP and Indy layouts.
Slightly different AI lines to prevent AI cars crashing into the barriers/walls on pit entry. See issue report: http://www.assettocorsa.net/forum/index.php?threads/brands-hatch-pit-lane-entry-ai-issues.32314/
Feel free to post in the thread above or support thread here if you find that AI or certain cars still have issues and I'll look into it.
Back up original files before moving mod files over.
To install unpack the 7zip archive and drop the content folder into ...\Steam\steamapps\common\assettocorsa\.