Concept:NHAI's core functions involve development, maintenance, and toll collection of national highways. It does not conduct training of highway engineers.
Explanation:The National Highways Authority of India (NHAI) is responsible for planning, building, and managing national highways.
It collects fees (toll) on these highways, which makes statement A correct.
NHAI also provides consultancy and construction services in India and abroad, so statement C is correct.
Regulation and control of vehicle movement on highways is primarily handled by the Ministry of Road Transport and Highways (MoRTH) and state transport departments, but NHAI does have a role in traffic management for its projects; thus statement D is considered correct in this context.
However, NHAI does not conduct training of highway engineers at entry level or in-service. That function is performed by the Indian Academy of Highway Engineers (IAHE).
Therefore, statement B is not correct.
Answer:Option B (Statement B is not correct).