Reckless driving and careless driving are similar charges under New Jersey Law. A reckless driver is a person who drives heedlessly in disregard of the rights of others and in such a way that is likely to endanger another person or property. The penalties for reckless driving are: up to 60 days in jail (90 days for a second offense), fines of up to $241 (up to $541 for a second offense), five points on your driving record.
Careless driving is essentially a less severe version of the same charge. A careless driver is a person who drives a vehicle without due caution in a manner that will (or likely will) endanger another person or property. The penalties for careless driving are: fines of up to $241 and two points on your driving record.