Pilot reported a vehicle on the airport road crossed the taxiway without stopping causing the reporter to stop their aircraft to avoid the vehicle.

Narrative

I was cleared to taxi by Ground Controller from FBO at ZZZ to Runway XX via Taxiway A. Along Taxiway A; there is a vehicle service road from the ATC Tower and some hangars within the airport environment that crosses over taxiway A. I was approaching this crossing eastbound toward Runway XX when I noticed a black SUV (looked like a chevy suburban) on the service road like he was planning to cross from left to right over the taxiway. However; when he approached the taxiway; he did not stop to yield to me in the aircraft taxiing along the taxiway. He continued at speed; without stopping or slowing down; to cross in front of me on the vehicle crossing point across the taxiway. I estimate he was traveling around 30 mph. I saw the vehicle approaching and when I realized he didn't look like he was going to stop; I stopped taxiing to allow him to pass. Once he was fully in front of me on the taxiway; he looked at me waiting and continued to cross over and leave the airport environment. I estimate I was within 20 ft. of the crossing point that he crossed when he crossed it without stopping.I immediately reported to the Ground Controller that the incident occurred; and the Ground Controller reported it to airport operations. I contacted airport operations after my flight and reported the incident. They had mentioned they had been able to get in contact with the occupants of the vehicle to take a statement; and that they had captured the incident on camera as well.