New Jersey officials today handed over to a Mercer County judge a secret study of traffic and revenue trends on state toll roads. Superior Court Judge Linda Feinberg requested the analysis, which is being used by Gov. Jon Corzine to devise a plan that would let a new state agency borrow billions of dollars and repay the debt with higher tolls. Corzine wants to use the windfall to finance long-lasting public improvements such as new bridges and schools without driving up the state budget. But his looming proposal has become a political issue because the administration has refused to release the report before Tuesday's election. Feinberg will privately review the highway study before announcing on Nov. 16 whether she will agree to a Republican request to make the document public. GOP members insist that since taxpayers already have forked over $800,000 for the study, the public should be allowed to see the data collected by a British consulting firm, Steer Davies Gleave of London. Administration officials insist they always intended to release the document but not until the consultants finish their work.