In Madrid, by far the worst-hit area, more than 500 taxi drivers signed up to volunteer through the PideTaxi app, and they have run more than 100,000 free trips.
With paying customers scarce, taxi drivers running doctors from house-to-house or taking the sick to hospital have become an essential service, their free rides helping frontline medics fight the virus.
Although epidemic peaked earlier this month, medics say the free taxis have made a huge difference.
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