An Arizona man is in the hospital with serious injuries after rolling an all-terrain vehicle in Pittsburg.At approximately 2:40 p.m. Tuesday, Martin Lam, 68, of Tucson, rolled his ATV next to the Farr Road ATV trail and became trapped underneath the machine. Members of Lam's riding party quickly came to his aid and pushed the machine off him and began to render first aid. Because there was no cellphone coverage at the crash scene, two members of the riding party rode to a local residence and made a 911 call for help.Martin was transported by ambulance to a landing zone adjacent to Route 3 near Day Road in Pittsburg. Upon arrival, Lam was flown to the Dartmouth-Hitchcock Medical Center in Lebanon for treatment of serious injuries.The cause of the crash is still under investigation and authorities do not have an update on Lam's condition at this time.