When does TACC switch to HOLD After 5 Seconds vs 30 seconds? All, Does anyone know the criteria for when TACC uses a 5 second hold vs. a 30 second hold? Sometimes my car uses 30s, sometimes 5s--I'm not sure what the criteria is. The 30 second hold is much nicer, and I wish it were used all the time. It doesn't seem to have to do with the set speed (something like 60mph or faster). Maybe it's using GPS to determine if you're on a large road or not?