Trip-end facilities at work appear to be significant determinants of cycling to work. Recent research conducted by Ralph Buehler of Virginia Tech found that commuters with cyclist showers, clothes lockers, and bike parking at work are five times more likely to commute by bicycle than those without trip-end facilities.
To learn more: http://www.theatlanticcities.com/commute/2012/07/hidden-factor-bike-commuting-showers/2650/