The crossing stops traffic in all directions to allow people to cross
Designers of the giant X crossing in central London's Oxford Circus are calling it an "instant success".
The firm Atkins said the design which is based on crossings in Tokyo had reduced pavement congestion.
Transport for London (TfL) said crossing should generate £6.5m in benefits from journey time savings - recouping its £5m cost in a year.
Street clutter and barriers at the junction of Oxford Street and Regent Street have been removed.
Kulveer Ranger, the mayor of London's transport advisor, said: "The new crossing has brought the area into the 21st Century by jettisoning unnecessary street clutter and railings, which frees people to move through it in an instinctive and direct way."
Taxi driver Russell Hall has been a black cab driver for 25 years and writes for cabbies' magazine Taxi Talk.
He said the £5m spent on the crossing by Westminster City Council could have been used elsewhere.
'More traffic jams'
"It is one of the busiest crossings and it is OK that pavements have been widened, but it's narrowed the junction.
"The lanes are now down to one lane instead of two lanes causing more traffic jams.
"Most drivers avoid it as it causes delay. In the ranks we talk about avoiding Oxford Street altogether but sometimes it is unavoidable."
"For pedestrians it may be beneficial but spending £5m on a junction to double the number of pedestrians is quite absurd."