The MTDB's enabling legislation also provided a dedicated funding source for guideway construction that would expire in 1981. Urgency was created since the dedicated funding would revert to the State highway fund if not expended on mass-transit guideway construction. In 1976–77, considerable planning efforts were completed. MTDB's 1977 "Guideway Planning Project: Phase I Report" identified many alignment options: Interstate highways I-5, I-8, and I-805; State Routes 94 and 163; railroad rights-of-way owned by Santa Fe (AT&SF) and by Southern Pacific/San Diego & Arizona Eastern (SD&AE); local arterials El Cajon Boulevard, 4th/6th/Genesee Avenues, and Highland/National/3rd/5th Avenues.