(a) The Los Angeles County Transportation Commission is authorized to impose a transactions and use tax within the County of Los Angeles pursuant to the approval by the voters of the commission’s Ordinance No. 16 in 1980 and its Ordinance No. 49 in 1990, and has the authority and power vested in the Southern California Rapid Transit District to plan, design, and construct an exclusive public mass transit guideway system in the County of Los Angeles, including, but not limited to, Article 5 (commencing with Section 30630 of Chapter 5 of Part 3 of Division 11).
(b) The commission shall conform to this article in letting contracts for the construction of that system.