CONTRACTOR'S DRIVER EXITED COAL PIT ACCESSING HAUL ROAD. DRIVER STATED THAT HE ENCOUNTERED A JUVENILE ON A 4 WHEELER COMING TOWARD HIM DOWN GRADE. DRIVER STATED THAT HE SWERVED TO THE RIGHT TO AVOID THE 4 WHEELER CAUSING THE TRUCK TO ENTER THE ROAD DITCH AND TIP OVER. THE TRUCK SUSTAINED SUPERFICIAL COSMETIC DAMAGE.