$14m plan for 700-space interchange carpark A $14 million carpark will be built at the Modbury O-Bahn interchange. THE State Government will build a $14 million multi-level carpark at Modbury to provide secure parking for O-Bahn passengers. The 700-car space park-and-ride facility will boost parking capacity at the Tea Tree Plaza Interchange by 75 per cent. Commuters will be able to park undercover 24 hours a day, every day of the week. This week Parliament's Public Works Committee will consider proposed plans for the carpark, including allowing commuters to pay for parking using the Metrocard system when exiting. Transport and Infrastructure Minister Tom Koutsantonis said the upgrade would meet the expected increase in commuter demand at the Tea Tree Plaza O-Bahn Interchange to 2021. "Most importantly for people living in the area, the new facilities with help alleviate commuter car parking congestion in surrounding residential streets," he said. Construction is expected to begin next month and be complete by the end of the year, employing up to 40 workers. The proposal includes four motorcycle spaces and 14 disabled parking spaces. Premier Jay Weatherill said the government was spending a total $17.1 million on better car parking, bike storage and improved safety for the O-Bahn route. "The O-Bahn is Adelaide's most popular public transport corridor," he said. Earlier this month the government announced work was underway to double car parking spaces at the Klemzig Interchange, to 234, and improve security measures. However, the multi-million upgrade will not include the installation of ticketing gates - similar to those which are used at the Adelaide Railway Station. The ticketing gates were identified by former Treasurer Kevin Foley in 2008 as an important way to speed up boarding times.