Allow telecommuting, compressed workweeks, conference calls, and flextime in order to eliminate or stagger commuting trips. Encourage carpooling among employees. Offer financial incentives for those willing to share rides, or reserve prime parking spaces. Advocate the use of public transportation.
Many companies subsidize bus tickets for their employees on a regular basis.
Institute casual dress day as an incentive or reward for employees who commute to work by foot or bicycle. Brown bag your lunch, or walk, instead of driving to a restaurant.