PND regularly performs detailed condition inspections of in-service bridges throughout the contiguous United States and Alaska. Its clients range from federal, state, and local agencies as well as private entities. PND maintains personnel who meet the qualifications of bridge inspection program manager and team leader, in accordance with the National Bridge Inspection Standards (NBIS). Additionally, PND has engineers in all of its offices who routinely attend the FHWA/National Highway Institute’s Safety Inspection of In-Service Bridges course and are qualified per NBIS criteria. Inspection methods include visual, probing, sounding, drilling, ultrasonic through thickness measurements, and timber microsecond timers. PND often load-rates the structures based on record documents, inspection observations, and structural calculations.