A child can generally sit in the front seat under these conditions:
- In the UK, children aged between 3 and 12 years or up to 135 cm tall may sit in the front seat if they use an appropriate child seat.
- In the US, many states recommend children be at least 13 years old before sitting in the front seat. The National Highway Traffic Safety Administration (NHTSA) and American Academy of Pediatrics (AAP) recommend children under 13 sit in the back for safety reasons.
- In Germany, children under 12 years or shorter than 150 cm generally should not sit in the front seat unless the back seat is unavailable or lacks seat belts.
- In Colorado, while law permits children to sit in the front if they weigh at least 20 pounds, safety guidelines recommend staying in the back until 13 years old.
- Airbags present significant risk to young children in front seats, so special care must be taken such as disabling airbags or pushing the seat back far enough if children must ride in front.
In summary, the safest guideline is for children to sit in the back seat until at least 12-13 years old or until they meet height and weight requirements for proper use of seat belts and child restraints. Exceptions exist but must consider airbags and child seat laws specific to each region. Let me know if you want information for a specific country or state.