UPS-Teamsters Pact Takes Effect As Detroit Workers Ratify Rider - Freightwaves UPS Inc. (NYSE:UPS) employees who are members of Teamsters Union Local 243 in Detroit ratified their local rider to the national, or “master” UPS contract on Sunday, April 28, allowing the five-year contract to take effect. The ratification process was unusual in that more than half of all voting Teamsters rejected the master contract. However, under the Teamsters constitution, a contract is considered ratified if less than half of the eligible voters cast ballots and less than two-thirds of those who voted cast ballots. About 44 percent of eligible UPS Teamsters voted, and the margin of defeat fell quite short of a two-thirds rejection. Perhaps the most controversial language in the master contract establishes a two-tier wage structures for workers not on the standard Monday-through-Friday pick-up and delivery schedule.