unity3d - unity 2D 5.0: collision with colliders, one with "is trigger" checked and one with "is trigger" unchecked -

i beginner in unity 5.0.

it hard describe problem, included 3 images. please see following:

http://frankiegamescom.ipage.com/question.html

please help. thanks.

i don't think should changing istrigger property of car_player in code. looks better solution:

leave box colliders on car , road blocks not triggers. let grass's box collider trigger. 2d rigidbodies need on the road blocks , car. car should stop when hitting road block if you're moving correctly; rigidbody2d.addforce or velocity.

if using transform.translate then think need add rect.overlaps infront of car , check collisions manually.

edit: looking @ screenshots again, looks leaving cars istrigger false , leaving grass colliders istrigger true might solve problem. , maybe use ontriggerstay2d to pass multiplier drag.