NJ CDL Doubles/Triples case studies
NJ CDL Doubles/Triples · Put your knowledge to work in context.
The New Jersey CDL Doubles/Triples (T) endorsement allows a commercial driver to operate a combination of two or three trailers - typically twin trailers pulled behind a tractor with a converter dolly linking them. It is used by line-haul and LTL drivers, and by anyone whose job requires moving double or triple trailer sets on public roads. The NJ CDL Doubles/Triples case studies are 5 cases and about 2,625 words.
1Coupling a Dolly That Sits Too High
At 05:30 at a Newark terminal you are assigned a set of 28-foot pups and a converter dolly. The lead trailer is already coupled to the tractor.
617 words, about 3 min2Pre-Trip After Rain: Dolly and Second Trailer
At 07:00 after an overnight rain, you inspect a parked doubles set before a 300-mile run. On the converter dolly you find a 3-inch crack in the frame near the drawbar eye, both dolly tires at 3/32 inch tread, and the dolly’s left spring-brake chamber pushrod at the readjustment limit marked on the chamber.
501 words, about 3 min3Braking a Triple on a 6% Grade
You are driving a 75,000-pound set of three 28-foot trailers down a 6% grade on I-80 near the Delaware Water Gap. The posted limit is 45 mph and you are at 58 mph.
465 words, about 2 min4Right Turn at a Tight Camden Corner
You are driving a 70-foot doubles set in Camden, turning right from a four-lane arterial onto a two-lane street. The corner has a curb, a fire hydrant on the right, and a parked delivery van 20 feet past the corner.
514 words, about 3 min5Scale Ticket Shows One Trailer Overloaded
At a scale on I-295, your 80,000-pound doubles set yields: steer axle 11,400 lb, drive tandem 33,800 lb, lead trailer axle group 16,700 lb, rear trailer axle group 18,100 lb. The steer limit is 12,000 lb, drive tandem 34,000 lb, and each trailer axle group is rated 17,500 lb.
528 words, about 3 min