Stewart later became chair of ALARM (All London Against the Road-building Menace), an umbrella group helping to link 150 local community campaigns in London. In the early 1990s, working with Twyford Down activist and poet Emma Must and transport campaigner Jonathan Bray, Stewart transformed ALARM into a national organization, ALARM-UK, to give 250 local campaigns a more powerful voice against the UK's national road-building programme. The organization's approach was summarized in the headline of a 1995 Guardian article as "Faith, hope and anger: An alliance between the respectable middle classes and radical activists is taking on that scourge of city life the car". As Stewart told ALARM-UK's inaugural national conference in 1993: "The Department of Transport's nightmare is that isolated local groups that have sprung up to fight a road scheme will start talking to each other, sharing information and co-ordinating campaigns. We want to make that nightmare come true".
