THE HAGUE – This really was the gold standard of road trips.The Netherlands' central bank transported its Dutch-based stock of gold — 14,000 bars and about 1,000 boxes of gold coins — from its headquarters in Amsterdam to a safe in the nearby city of Haarlem in a meticulously and closely guarded operation that ended Saturday, the bank said in a statement.Along with the bullion worth 10 billion euros ($11.7 billion), the bank also shifted bills worth another 4.5 billion euros ($5.3 billion) in the operation that was led by the Royal Dutch Military Police.The cash and gold traveled about 20 kilometers (12.5 miles) in trucks guarded by armed military police, police motorcycle outriders and with a police helicopter hovering overhead.