N.Y. Comp. Codes R. & Regs. tit. 17 § 830.1
Upon taking precautions deemed by them to be sufficient to assure payment of the tariff charges within the credit period herein specified, common carriers by motor vehicle may relinquish possession of freight in advance of the payment of the tariff charges thereon and may extend credit in the amount of such charges to those who undertake to pay them, such persons herein being called shippers, for a period of 15 days, including Saturdays, Sundays and legal holidays. When the freight bill covering a shipment is presented to the shipper on or before the date of delivery, the credit period shall run from the first 12:00 midnight following delivery of the freight. When the freight bill is not presented to the shipper on or before the date of delivery, the credit period shall run from the first 12:00 midnight following presentation of the freight bill.
N.Y. Comp. Codes R. & Regs. Tit. 17 § 830.1