China has moved to tighten regulations on used car exports, cracking down on new vehicles falsely declared to be second hand, in the latest step to ensure fair and orderly market activity.Starting next year, exporters will have to prove after-sales service is available at the destination for vehicles that have been registered for less than 180 days, according to a notice released by the Ministry of Commerce on Friday. The availability of after-sales service must be confirmed by the car...