The Blues star, 32, did not attend the hearing at Staines Magistrates court but his solicitors informed the court of his guilty plea by fax. Lampard had previously denied the charge.
Trouble: Frank Lampard in action for Chelsea in the FA Cup tie with Everton
The England star - who scored the winner in Chelsea's win over Manchester United on Tuesday - was driving his Range Rover on Esher bypass, in Claygate, last March when he was clocked.
His solicitors sent a fax to the court on March 1, informing them that he wanted to change his plea, but was unable to attend and requested an adjournment.
The reasons given for his non-attendance were that due to professional and child care commitments he would prefer an afternoon hearing.
Lead magistrate, Malcolm Bond, noted that it was a very late guilty plea and warned that if Mr Lampard failed to attend he could face possible disqualification.
The case has been adjourned until next Friday.
So, who will blink first? United heading for title showdown with Arsenal. but don't rule out Chelsea yetLeo's London: Rooney off the hook again as Blues get back in the grooveAncelotti: Title still out of reach despite victory over leaders Man UnitedAll the latest Chelsea news, features and opinion
Explore more:People: Frank Lampard Places: United Kingdom