Speed bumps or temporary signage indicating speed

Issue: Permanent Sign (Add or Modify)

Details of request: Request for a speed sign or speed bumps/traffic calming around this corner. There is consistently one family of cars that continue to speed around this corner even after speaking with police on several occasions. Best solution would be speed bumps but perhaps in the meantime a temporary sign indicating the speed limit & displaying your speed so they could see just how fast they are going.

Specific location details: Corner indicated in the photo