The 33-year-old Amaroo man declined to be named or to speak at the scene except to say he was feeling "good, considering," after the lunchtime crash.

The motorist was heading south on the busy thoroughfare just after 1.30pm when he lost control of his vehicle and hit the tree, the impact crushing the roof of the dual cab ute.

Witnesses said they saw the car and another vehicle racing just before the crash.

An ACT Fire Brigade unit was called to the scene but the driver had already managed to escape from the vehicle through the upturned driver's side window.

Southbound traffic on Northbourne Avenue was reduced to one lane for about 40 minutes after the crash.

ACT Policing's Crash Investigation Team is examining the cause of the accident.

Meanwhile, police say that 122 drivers were booked for traffic offences in the territory over the Easter holiday, a significant decrease on last year's total of 201.

Those infringements included 59 speeding tickets, three drivers fined for seatbelt offences, a suspended NSW P-plate motorcyclist caught riding at 180km/h in an 80km/h zone on the Monaro Highway on Sunday and a 26-year-old unaccompanied learner driver with a 0.132 blood alcohol reading on Commonwealth Avenue on Saturday.

Head of Traffic Operations Superintendent Mark Colbran said he was generally pleased with driver behaviour during the five-day double demerit point period.

"It was encouraging to see drivers heed the warnings put out by ACT Policing and NSW Police for the Easter period and that the majority of drivers did plan and prepare their trips," Superintendent Colbran said.

"In particular it was heartening to see the Kings Highway remain a fatality-free stretch of road both here and across the border."

However, he said he was concerned that the number of drink drivers caught over Easter doubled from 16 last year to 33 this year.

"Whilst we were pleased with the fatality-free period, at least 33 people placed themselves in a position where they could have ended up as a fatal statistic," he said.