Saquon Barkley is stepping up in a huge way for a police officer badly injured in a car accident ... offering Giants tickets and sending a special personal message of support.
Port Authority police officer Peter Siano was hospitalized in critical condition Tuesday after he was hit by a car while securing a crash scene.
Siano -- along with 3 Jersey City PD officers -- were handling traffic control around the crash when a driver sped through warnings and smashed into a JCPD cruiser, which hit Siano.
Officials say Siano suffered "serious" injuries -- and the driver responsible for the collision has been arrested and charged with assault by auto.