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Real-time public transport information has been shown to improve travel satisfaction, but its effect on traffic and travel behaviour remains an open question. In this paper, we analyse the case of Red, a nationwide real-time public transport app in Chile. Through a survey conducted on the app, we analyse the effects on modal choice, induced demand, vehicle kilometres travelled (VKT) and environmental externalities. We find that (i) when using Red, the perceptions of reduced waiting time and increased security are positively correlated (ii) modal substitution is about 10%(iii) urban buses gain and lose passengers (3: 2 ratio), competing mainly with shared taxis and ride-hailing,(iv) the induced demand for public transport is about 1%,(v) the app reduces total VKT (probability P= 0.99), and (vi) CO2 and local air pollutant emissions decrease only under high vehicle emission standards (up to 14 gCO2/trip). The policy and technology implications are discussed.