Medium Transport
Flight Crew Commercial
Communication Breakdown; Confusion; Distraction; Situational Awareness
Conflict Ground Conflict; Less Severe; Deviation / Discrepancy - Procedural Clearance; Ground Incursion Runway
Air Traffic Control Issued Advisory / Alert; Flight Crew Became Reoriented; Flight Crew Took Evasive Action
Airport; Environment - Non Weather Related; Human Factors
Given a clearance to taxi from the Ramp; T to 4 to P hold short of 30L.  After crossing 30L and while on 4; looking for P; I crossed 30R; thinking I had clearance to cross 30R; but then realizing I already had clearance for 30L! Realized it while an aircraft flew overhead and by that time I was already across 30R. Followed instructions from Tower and called in when I got to my destination. Please do not use Runway 4 for taxiing operations during night/low light time. There are no wig wag lights when one is on the runway; as opposed to a taxiway.
A pilot taxiing on Runway 4 to Taxiway P; was cleared to cross Runway 30L; but became confused and realized after crossing Runway 30R that he did not have clearance to do so.