homeless deterrent

(名詞) 防止遊民睡在某一特定地方的實體障礙或設計。
homeless-deterrent (形容詞)

It has been encouraging to see the outrage over the London spikes. But the spikes that caused the uproar are by no means the only form of homeless-deterrent technology; they are simply the most conspicuous.
—Robert Rosenberger, "How Cities Use Design to Drive Homeless People Away," The Atlantic, June 19, 2014

Although it hasn't been stated that the spikes are intended to be a homeless deterrent ('cause why state the obvious?), that hasn't stopped people from speaking out against them.
—Brittany Greenquist, "PHOTOS: Spiked Sidewalks, Slanted Benches and Other Inhumane Homeless People 'Repellents'," RYOT, June 10, 2014