Follow CBSMIAMI.COM: Facebook | Twitter

TALLAHASSEE (CBSMiami/NEWS SERVICE OF FLORIDA) – SunPass toll transactions are starting to be processed, 22 days after a $287 million upgrade to the system was expected to be completed.

READ MORE: Demolition Begins Monday On Remains Of FIU Pedestrian Bridge That Killed 6 In Collapse

The Florida Department of Transportation on Tuesday thanked customers for their patience as the SunPass Centralized Customer Service System gradually posts tens of millions of transactions in the order they were made since the upgrades began on June 6.

“Late fees and penalties will not be imposed until the system is operating fully and providing the benefits and ease of access that SunPass customers deserve and expect,” Department of Transportation spokesman Ed Seifert said in a prepared statement.

The work to consolidate electronic tolling authorities into a single billing system was expected to be completed on June 11. The state had warned the 6.5 million SunPass customers to ensure their pre-paid transponders had enough money on hand to cover collection once the upgrade was completed.

READ MORE: Miami Police Chief Art Acevedo Calls Out Commissioners In Scathing Memo Ahead Of No Confidence Vote

But the conversion took longer than anticipated, with one state official last week pointing to “unexpected challenges.” The state agency said Tuesday that 4 million transactions had been processed.

The system handles 4 million transactions a day, according to the state.

Siefert reiterated Tuesday that the state intends to hold the vendor, Conduent, accountable for the delays. No penalties have been announced.

MORE NEWS: Blue Alert Issued Out Of North Florida County For Patrick McDowell, Accused Of Murdering Deputy During Traffic Stop

As part of the conversion, SunPass Plus parking has been expanded from Orlando International Airport to include Miami International Airport, Fort Lauderdale-Hollywood International Airport, Palm Beach International Airport and Tampa International Airport.