Spot is focused on the asphalt path ahead, where a few joggers and bicyclists are out for some socially distanced sunshine. A cyclist in a brimmed hat rides past. Spot pipes up, not with a bark, but with a recorded message. Let's keep Singapore healthy," comes a woman's voice, polite but firm. "For your own safety, and for those around you, please stand at least one meter apart. Thank you." Spot [is] an agile, four-legged, arrestingly doglike robot that Singapore has deployed to help enforce distancing measures during the second month of a partial coronavirus lockdown. Developed by Boston Dynamics of Waltham, Mass., Spot is one of the world's most advanced commercial robots, last seen opening doors, hauling a truck or dancing to Bruno Mars in a slate of mesmerizing promotional videos. Its two-week pilot in a park here is seen as a test of how machines and artificial intelligence could help reduce human contact in public spaces. Singapore officials said the goal of using Spot was "reducing the manpower required for park patrols and minimizing physical contact among staff, volunteer safe distancing ambassadors and park visitors." Cameras installed on its body will help estimate the number of visitors in the park, but officials said they cannot recognize individuals. If the trial is successful, officials said they would consider deploying Spot ... at other parks. A second Spot robot has also been in use since last month to deliver medicines at an isolation facility housing thousands of COVID-19 patients.