To understand whether telecommuting could be part of the policy solutions for greenhouse gas reduction in the transportation sector, this study uses Instrumental Variable Tobit models and data from 2001 and 2009 National Household Travel Surveys to explore whether telecommuting reduces or increases the daily work and non-work vehicle miles traveled. Our findings suggest telecommuters have more vehicle miles traveled for both daily work and non-work trips than non-telecommuters. Adding the findings that telecommuting has no impact on other non-working household member's daily total (non-work) trips, we can possibly argue that households with telecommuter(s) tend to have higher daily total vehicle miles traveled. Our estimated marginal effect of telecommuting on worker's daily total trips indicates that, a telecommuter on average travels 38 vehicle miles more on a daily basis in 2001 and 45 vehicle miles more in 2009 compared with a non-telecommuter. These increases in vehicle miles traveled translate into a rather large increase in greenhouse gas emissions in the U.S. equivalent to adding 7,248,845 cars in 2001 and 8,808,165 in 2009 to the road. Moreover, the difference of this marginal effect between 2001 and 2009 suggests the impact of telecommuting on worker's daily total vehicle miles traveled had increased over time. With the emerging work arrangements to work from home, telecommuting has been welcomed in this changing environment, not only by individual workers and employers but also policymakers. But the outcomes seem to be opposite to what policy makers may have expected for GHG emission reductions.