A transportation funding referendum for Los Angeles County passed in 1990 providing for a second one-half cent sales tax for transportation related projects. One fifth (20%) of the funds generated, (referred to as Local Return Funds) are earmarked for transportation projects. Twenty-five percent (25%) of the balance is for street and highways (provided transit operates on the streets), ten percent (10%) is for commuter rail, five percent (5%) is for transit related security measures, and the remaining balance of forty percent (40%) is discretionary with the funds currently allocated to both bus and rail projects; effective April, 1991.