(KRON) – The Santa Clara Police Department is investigating a solo fatal car crash that occurred on Friday morning that caused road closures. No further information has been released.  Petaluma man sentenced for threatening military personnel in YouTube video There are road closures on Agnew Road between Harrigan Drive and Montague Expressway.  The Santa Clara Police Department asks drivers to avoid the area and use alternate routes. Police said the southbound lanes of De La Cruz Boulevard at Montague Expressway are also closed.   Stay tuned with KRON4 for updates.