Flowering now in the rock garden is the European native, Anthyllis coccinea…aka: red kidney vetch. This small rock garden legume (Fabaceae) is still in its first full year in the ground, having been planted last June…so far, so good.
Red Kidney Vetch
Your vetch is pretty. The vetch in the US will swallow everything.
You are most likely referring to Crown vetch (Securigera varia), which is a horrid weed. It has been used for decades in the US for highway cut stabilization.