How much steering wheel play (free play) is acceptable in a heavy truck steering system before it is considered out of adjustment?

1. No play is allowed; the wheel must be completely rigid
2. Not more than 10 degrees of play (approximately 2 inches of movement on a 20-inch steering wheel)
3. Up to 30 degrees of play, to allow for comfortable highway cruising
4. Play is only restricted on passenger cars, not commercial trucks