The bill modifies the definitions related to commute trip reduction in Washington State by updating specific numerical thresholds and removing time restrictions on work hours. Key changes include defining a "major employer" as one that employs 100 or more full-time employees at a single worksite for at least 12 continuous months, without specifying the time frame for when employees begin their workday. Additionally, the term "affected urban growth area" now includes areas with a population over 70,000 that have adopted a commute trip reduction ordinance before 2000, and it maintains the 100 person hours of delay threshold for state highway segments.

Other definitions, such as "base year," "major employment installation," and "major worksite," have also been updated to reflect the new 12-month period and the 100 employee threshold. The bill removes the requirement for employees to start their workday during the peak morning hours of 6:00 a.m. to 9:00 a.m., thereby broadening the scope of what constitutes a major employer and potentially increasing participation in commute trip reduction efforts. Overall, these amendments aim to enhance the effectiveness of commute trip reduction strategies by making them more inclusive and adaptable to various employment scenarios.