Pilot explained an uncharted access road that is being mistakenly used for aircraft; yet not rated for that purpose. Reporter cited lack of signage and charting as contributory factors.

Narrative

Related facts: 1) The Air Traffic Ground Control Tower is located where the Ground Controller cannot see from approximately the mid point of the South ramp East -- including the East tiedown and the adjacent T hangars. 2) The South ramp is a non-movement area South of approximately the mid point of Taxiway G. Situation: There is a ground vehicle access road that runs between the east side of the South ramp and the end of Taxiway E and is adjacent to the South Hangar. (The pavement does not exist on the airport diagram.) This road has been blocked until recently when it was opened to allow FBO ground vehicles. The road is used primarily by fuel trucks. I have observed aircraft using this road -- which is not a taxiway or a part of the a non-movement area as a shortcut when taxiing east of the South ramp. I observed a near collision between an aircraft using this cut through and a fuel truck that was attempting to use the road. The fuel truck came down the east side of the South hangar and could not see the aircraft due to the South hangar blocking his view to the Northwest and West. Fuel trucks are not expecting to meet an aircraft on this road which is not a taxiway and cannot be a taxiway due to insufficient clearance to the South hangar. Fuel trucks often round the Northeast corner of the South hangar without stopping. Some Air Traffic Controllers have also been issuing taxi clearances to/from the South ramps using this cut through or suggesting that aircraft use this cut through. The road needs to be blocked to aircraft and or properly marked with the red sign that has a white circle with a white horizontal bar in it indicating no aircraft entry. These signs are used elsewhere on the airport to prevent aircraft from entering other vehicle access roads.