sentences:  The ultimate objective of the new HDIUT program is to allow for a significant streamlining of engine certification if a truly robust in-use emissions testing program proves feasible and cost effective.Time-consuming and expensive laboratory assessments of engines could then give way to real-world, real-time emissions assessments that efficiently provides more relevant data.Basically, the HDIUT is an industry agreed to manufacturer run, in-use, on-road testing program.