NY CDL Doubles and Triples case studies
NY CDL Doubles and Triples · Put your knowledge to work in context.
The Doubles and Triples endorsement is added to a New York Class A commercial driver license to authorize operation of a tractor-trailer combination that pulls two or three trailers. It matters for drivers who want to work in line-haul, package-freight relay operations, or any carrier that moves multiple pups or long combinations rather than a single trailer. The NY CDL Doubles and Triples case studies are 5 cases and about 3,201 words.
1Cold-Morning Build: Dolly Height and a Dead Second Pup
February, 14°F at a Syracuse terminal, and you are building a set of 28-foot pups. You back under the lead trailer, the jaws close, and the pull test in low gear holds with the trailer supply valve pulled out.
682 words, about 3 min2Leak Test Fails Only With the Brakes Applied
At a distribution center you add a second 28-foot pup to your set and run the air-brake checks. Charged to 120 psi with the engine off and the brakes released, the gauge falls 2 psi in one minute.
653 words, about 3 min3Six Percent Grade with 78,500 lb and Fading Brakes
You are westbound on a 6% grade with a 3-axle tractor and two loaded 28-foot pups, about 78,500 lb GCW. You started down in 6th at 45 mph, but a third of the way down you are at 61 mph and 2,100 rpm.
625 words, about 3 min4Right Turn, a Box Truck at the Door, and a Tight Curb Return
You are turning right from a four-lane arterial onto a two-lane street with your tractor and two 28-foot pups. The curb return is tight, about 15 feet, and the stop line sits 10 feet back from the corner.
607 words, about 3 min5Triples, a Crosswind, and the Last Van Swinging
You are eastbound on the Thruway at 62 mph pulling three empty 28-foot vans. A crosswind from the right is gusting to 25 mph, and a curve posted 45 mph is about a quarter mile ahead.
634 words, about 3 min