An SUV and an autorickshaw were damaged after a portion of Maujpur Road in north-east Delhi caved-in on Monday night, the police said.
No casualties were reported as locals managed to evacuate the occupants before the police arrived at the spot.
The occupants have only sustained minor injuries, the police said.
An inquiry has been initiated into the incident.
A case of negligence will be registered after inquiry on Tuesday, they said.
Deputy Commissioner of Police (North-East) Atul Kumar Thakur said a section of the road near the newly constructed Maujpur metro station suddenly caved in at 9 p.m.
The locals rushed to the spot and safely pulled out the occupants from the two vehicles. The Delhi Fire Service and the Public Works Department were also informed about the incident.
Officials suspect that a leak in a water pipeline led to the road collapse.
A team of engineers have been rushed to the spot enquire into the incident.
The SUV and an auto-rickshaw were later pulled out with the help of cranes.
The spot was barricaded and traffic diverted through Shahdara and Brahmpuri, said a traffic police officer.
Snarls reported
The incident led to snarls on the stretch, which is a busy route between Delhi and Loni.
Traffic officials said the road will be closed for the next few days till the pit is repaired.
Police sources said a major mishap was averted since the road was jammed due to heavy traffic else more cars would have gotten stuck in the collapse.