Some staff at Derby's new super hospital have said they are unhappy journey times to work will increase after missing out on parking permits.
Hundreds of workers will have to park in the city or at the old Derbyshire Royal Infirmary because the new Royal Derby does not have enough spaces.
Staff have said it will increase their travelling time by up to two hours.
Derby Hospitals NHS Foundation Trust said it had spent £250,000 on a free bus service from the car parks.
Brian Ibell, assistant chief executive for Derby Hospitals NHS Foundation Trust, admitted the trust could only provide as many spaces as it had been given planning permission for.
He said the hospital was guided by government policy to reduce dependence on car usage and boost the use of public transport.
"We have been able to allocate every member of staff with a car parking space either at the new hospital or back at the DRI with a free bus service.
"Unfortunately we've had more applications for car parking spaces from staff than we've been able to satisfy parking [at the new site].
"The trust has paid over a quarter of a million pounds for a 10-minute bus service six days a week early to late to get staff to and from work for those unfortunate enough not to have a campus pass," he said.
The first part of the £333m hospital, which was built on the former Derby City General Hospital site, opened to patients in March 2006.