The mishap took place last night when the trio was on way to Rohini after attending a wedding ceremony at Inderlok, they said.
The injured have been identified as Deepak (22), Anjum (24) and Puneet (25), all residents of Sector 24 in Rohini. They were shifted to a nearby hospital.
"All of them are colleagues and had left for the wedding at 8 PM from their office. As we received a call our team immediately rushed to the spot for rescue," a senior police official said.
Puneet was driving the car and lost control over it before crashing into a divider, the official said.