Mumbai, March 21 -- The state transport department on Thursday extended the deadline for installation of High Security Registration Plates (HSRP) on vehicles registered before April 1, 2019 till June 30. In an internal circular issued to all regional transport offices (RTO), transport commissioner Vivek Bhimanwar said the extension was necessitated due to slow progress in installation of HSRP on nearly 21 million vehicles registered before April 1, 2019. The department had earlier extended the deadline from March 31 to April 30....