The　monitoring　of　bridges　is　a　crucial　operation　for　their　structural　health　examination　and　maintenance.　GNSS　technology　is　one　of　the　methods　which　are　applied　with　the　main　advantage　that　the　direct　measurement　of　the　bridge　displacement　is　conducted　in　an　independent　global　coordinate　system.　However,　the　high　cost　of　the　GNSS　stations,　which　are　consisted　of　dual-frequency　receivers　and　geodetic　GNSS　antennas,　is　the　main　reason　of　the　limited　application　of　GNSS　for　bridge　monitoring.　In　this　study,　we　assessed　the　performance　of　low-cost　multi-GNSS　receivers　in　monitoring　dynamic　motion,　similar　to　that　of　bridge　response.　The　performance　of　the　low-cost　GNSS　receivers　was　assessed　based　on　controlled　experiments　of　horizontal　and　vertical　motion.　For　the　horizontal　motion,　controlled　experiments　of　circular　motion　of　various　predefined　radius　between　5　and　50　cm　were　executed　where　the　low-cost　GNSS　receivers　were　assessed　against　dual-frequency　geodetic　receivers.　For　the　vertical　motion,　manually　controlled　experiments　of　vertical　oscillations　of　amplitude　8　and　15　mm　were　executed　where　the　low-cost　GNSS　receivers　were　assessed　against　the　Robotic　Total　Station　(RTS).　Finally,　a　low-cost　monitoring　system　formed　by　two　closely　spaced　low-cost　GNSS　receivers　was　applied　in　dynamic　displacement　monitoring　of　the　Wilford　Suspension　Bridge.　The　analysis　of　the　low-cost　GNSS　data　revealed　the　beneficial　contribution　of　(i)　the　multi-constellation　on　the　accuracy　and　precision　of　the　GNSS　solution　and　(ii)　the　combination　of　closely　spaced　low-cost　GNSS　receivers,　to　limit　potential　cycle　slips　and　the　low-cost　GNSS　noise　level　and　reach　accuracy　and　precision　similar　to　that　of　geodetic-grade　GNSS　receivers.　This　was　confirmed　in　the　bridge　monitoring　application,　where　the　main　modal　frequency　and　the　response　amplitude　of　the　bridge　were　identified　successfully　by　the　low-cost　GNSS　receivers＇　data　analysis.