jumping

WHEN I PLAY THE MISSION I FEEL THE TIME TOO FAST ,HOW CAN I SLOW DOWN TIME

when i add aparking to park a police car ,it will go to the area,but they can not park correctly ,the area is a pervectly rectangle

hi, i want add policestation parking ,the LA mod only has five parking ,it did not enough for me, i am a new,so please tell me detailed