It will depend on the specific law and how it was written. But in general, yes, the driver is responsible for the actions of the passengers.
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In most cases both the driver and the passenger can be cited. The logic is that the passenger has a responsibility to wear a seatbelt and the driver has a responsibility to be sure that they do.
More information is needed. What type of passenger, where, and restrained for what.
the driver
since you were the one driving the car you were responsible for the safety of all passengers in the car. so by law you get the ticket for him not wearing his seatbelt.
usually, no; however, after sometime, if you continue to get caught for not wearing your seatbelt, you license can be suspended
In the UK the driver is responsible if the person is under 13 years of age.
He and/or the driver can be ticketed for not wearing a seatbelt but coverage still applies. Typically the insurance policy contains no such exclusion of coverage for passengers who refuse to wear a seatbelt. You would not want the exclusion on your policy otherwise your passenger's attorney would have no other recourse than to come after your personal assets.
A ticket in Wisconsin for not wearing your seat belt is $10.00 for each individual. The ticket can apply to the driver, passenger, and rear seat riders not wearing a seat belt.
you are wearing the seatbelt.
In 2008, 53% of passenger vehicle occupants killed in crashes were not wearing seat belts. This translates to approximately 13,000 fatalities involving people who were not wearing seat belts.