South Coast Air Quality Management District (SCAQMD) provides extensive guidance on collecting information about workers’ commuting behavior. Rule 2202, On-Road Motor Vehicle Mitigation Options Employee Commute Reduction Program Guidelines (February 2004), Chapter II, establishes practices that meet LEED for Existing Buildings: O&M standards for this credit. The Rule 2202 document can be found online here. For additional information on survey techniques and tools for compliance, see Rule 2202, Employee Commute Reduction Program AVR Survey Support Guide (July 29, 2005), available online here.