The secrets of the world's happiest cities | Society | The GuardianResearchers for Hewlett-Packard convinced volunteers in England to wear electrode caps during their commutes and found that whether they were driving or taking the train, peak-hour travellers suffered worse stress than fighter pilots or riot police facing mobs of angry protesters. But one group of commuters report enjoying themselves. These are people who travel under their own steam, like Robert Judge. They walk. They run. They ride bicycles.