Through traffic on Rejtő Jenő Street (and residential parking spaces)

On Rejtő Jenő Street, everyone cuts off the traffic light at the corner of Izabella-Wesselényi Street, vehicles are driving through a narrow street at a tremendous speed. Wouldn't a speeding sign alone solve the situation? Could it be possible to use speeding police to make the cars slow down? In addition, there are 12 designated parking spaces for residents on the street. Usually there are about 6 cars there, except during theater performances (between 6 and 10 pm), when it is impossible to park on the street, and I have to adjust all my time schedules to the theater performances. Could something be done about better marking and monitoring the residential spaces?