Seven others, including a woman and an infant, were critically injured in the accident that happened late Saturday night.
Ganesh and Vineet, both 25, Hero Moto Corp employees and residents of Delhi's Swaroop Nagar, died.
Eight employees of the company were going to their Gurgaon office from Delhi.
They stopped the car on the flyover after one of them complained of uneasiness.
However, another car coming from Delhi rammed into the parked vehicle from behind due to fog, said a senior police officer.
The driver of the second car is a resident of Gurgaon. He, along with his wife and one-and-a-half-year daughter, besides four others in the other car, suffered grievous injuries.
All were admitted to various hospitals.
--IANS (Posted on 22-12-2013)