Original sentence: Several north-south routes, including Interstates 81, 83, 87, 89, 91, 93, 95, and 97 all lie east of Interstate 99.The number "99" violates the AASHTO numbering convention associated with Interstate highways.Under this system, the lowest numbers start on the West Coast progressing in order to the highest numbers on the East Coast
Edited sentence: However, many suitable three-digit route numbers were available, such as I-370 or I-576.It had been designated as a High Priority Corridor by the Intermodal Surface Transportation Efficiency Act of 1991.The number was not chosen to fit the grid, as it lies between Interstate 79 and Interstate 81, and no suitable two-digit number was available