SECTION 4. Section 707.003, Transportation Code, as added by this Act, applies only to a contract entered into on or after the effective date of this Act. SECTION 5.(a) Except as provided by Subsection (b) of this section.This Act takes effect September 1, 2007. (b)This Act takes effect only if SB 125, Acts of the 80th legislature, Regular Session, 2007, is enacted and becomes law.