The incident took place around 10.30 AM while Head Constable Santosh was on duty near the Rohini court.
"Santosh flagged down a car driven by Virender Sangwan (29), a lawyer when he saw him approaching Gate No 5 of the court from the wrong side. On being stopped, the lawyer came out of the car and started an argument. He then punched and slapped the policeman," said a police official.
However, locals intervened and cop was rescued while the lawyers went inside the court.
Santosh then reported the incident to the police post inside the court premises and the lawyer was summoned there.
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"After preliminary enquiry, an FIR has been registered against the lawyer under Section 186 (obstructing public servant in discharge of public functions) and Section 353 (assault or criminal force to deter public servant from discharge of his duty) of IPC," said Deputy Commissioner of Police (Outer) Vikramjit Singh.
The traffic constable is posted with the Rohini traffic circle while Virender Sangwan is an advocate at the Rohini court in Outer Delhi.
Marking the Police Commemoration Day, Union Home Minister Rajnath Singh today paid tributes to martyrs of the force.
There have been four such incidents in the last ten days, where four police men including an Assistant Commissioner of Police were attacked.
On Sunday night, two Delhi Police constables were attacked by a group of men, who were confronted for allegedly drinking and gambling in a park in Uttam Nagar area of west Delhi.