B737-700
Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Last 90 Days 148
Confusion; Situational Awareness
Deviation / Discrepancy - Procedural Clearance; Ground Incursion Taxiway
General None Reported / Taken
Human Factors; Chart Or Publication; Airport
We were cleared to taxi to Runway 35R via taxiway G; Runway 11; taxiway D on taxiway D; we were confused by the markings at D-D1. The yellow lights were flashing on D; and the markings were nonstandard. We turned at D1 rather than the end at D. We took off at D1 rather than the full length. I checked the performance numbers; at a safe altitude; and we had plenty of safety margin. What's up with the markings on taxiway D?I should have reviewed the airport diagram better. We had planned on Runway 35L for departure; and talked about the displaced threshold.
A B737NG departed SDF Runway 35R from Taxiway D1; rather than Taxiway D; as cleared by Ground Control.