Officially, CHART ETP (Emergency Traffic Patrol.)If you want to hear where accidents/roadside hazards are. All the HELP trucks (or whatever they are called) use and are dispatched on those talkgroups.
Adding these talkgroups to broadcastify doesn't really compromise the scanner itself, it simply just adds to what TGs are recorded and sent to the website.
Although none showed up when I had a flat on I-70 last Friday evening, and waited 3 hours for roadside assistance from Tesla (Tesla MYs have no spare tires.)