Stop sign need better collisions

[FritzsHero]

Describe the bug In it's current state stop signs have a Rigidbody component and a box collider. However this collider is to small to keep the stop sign in it's position when entering play mode. There is also a code workaround in place which sets the Rigidbody to kinematic and not using gravity effectively keeping stop signs in place like a wall. Stop signs should be able to be knocked down or even getting knocked into the air, if the force that hit them is high and react with the corresponding physics. Planned for future.