Here you can see the pretty simple construction for the wooded barricade. These were painted blue and then a 'Police Line' sign was added.
These are simple concrete barricades cut from 1/4" mdf board. They've been glued to a tongue depressor base and spray painted grey with some tan highlights. then I added some 'twisted-wire' on top of the wire to represent barbed wire.
Here's how all the pieces go together to create a fortified checkpoint or redoubt.
The front of the 'Road Closed' sign. The bottom feet are 1/8"x1/8" bass wood. The vertical dowels are 1/8" diam. The horizontal slats are 1/4" x 1/8" bass wood.
Here's the back of the sign to show the limited amount of structure is required.
This is the orange and white striped warning material. I cut it into 1/4" strips and glued it to the horizontal 'Road Closed' sign slats.