The Chief Executive Officer of Dublin Bus has said the real-time passenger information (RTPI) service is "operating at nearly 98% accuracy".
Billy Hann said "many of the technical challenges" with the system have been resolved.
He was speaking at the Oireachtas Committee on Transport, which also heard that while progress is being made on recruiting bus drivers, congestion continues to disrupt services in Dublin, and may drain funds intended to expand services.
Anne Graham, Chief Executive Officer of the National Transport Authority (NTA), said that "driver recruitment has increased".
"We are now seeing a much improved service delivery and the level of cancellations has significantly reduced," she said.
"It is expected that both operators will be very close to meeting their contractual targets [...] in this current period," she added.
However, she warned that the "impact of congestion on punctuality has intensified in recent weeks, and this can result in curtailments or cancellation of services".
"Additional funding that may be available to Authority in 2023 for additional services may have to be assigned to address congestion issues," she added.
"The only solution to this continues to be the reduction in the number of cars on the road," she said.
Passenger numbers in recent weeks are "over 105% of 2019, which itself was a record year".
"A software bug that was also impacting the accuracy of the Real Time Passenger Information information [...] has been fixed" and "this has improved the quality of the information", she said.
Mr Hann said customer numbers are "expected to reach 122m by the end of 2022", which is higher than before the pandemic.
The company has mounted several initiatives to improve services, but "there is no doubt that we have found this challenging".
Mr Hann, who noted that today marked his 13th day as Chief Executive of Dublin Bus, said that he "would like to apologise to any customers who have had a poor customer experience when using our services in recent months".
"Dublin Bus is currently running the biggest recruitment drive in the history of the organisation", he said.
He said 319 drivers have been recruited since January 2022, with 39 added since its last appearance before the Transport Committee last month.
"We are short 120," Mr Hann said, adding to cover all gaps - including those arising from retirements - Dublin Bus must recruit 280 staff by the end of 2023.
It will be the second quarter of next year "before we hit the required driver numbers", he revealed.
"We very much regret the impact this is having on customers," he added.
Andrew Edwards, MD of Go-Ahead Ireland, said the company is in "in a much better position than we were in November".
"We continue to have strong numbers of people joining us," he said.
Mr Edwards said attrition rates have halved and the bus operator is "interviewing between 40 and 50 applicants a week".
"By the end of the year [...] we will be very close to having our target number of drivers," he said, but warned that getting paperwork processed remains a problem.
He accepted that "certain routes do still experience day-to-day disruptions which we acknowledge and are continuously working to address".
