Today may be another frustrating day for those who depend on bus service in and around Bridgeport.

Greater Bridgeport Transit has canceled some suburban routes this morning as it restores service following major delays and cancellations yesterday.

The GBT says nine drivers called out this morning, forcing them to cancel five lines and limit service on others. Yesterday, 40 of the 72 drivers called out sick, forcing a suspension of all routes.

Some drivers told News 12 Connecticut off camera that the apparent sickout is a protest over pay and working conditions. GBT and drivers have been negotiating a new contract since January. It's set to go to arbitration this fall.