Six flag spawns. Six! It's five now.
It's the Battle Box. I don't know what else to say.
Also one of the flag spawns is in a tunnel.
Update 2021-10-02: Updates made (glass roof) to prevent map escapees.
Update 2021-10-02 II: Map name in-game update.
Update 2021-10-04: Color change by tunnel entrances to make them more visible.
Update 2021-10-10: Big update, major layout changes, new map tag
Update 2021-10-11: Minor update, some barrier items added so you can't wedge the car out of the map.
Update 2021-12-15: Layout change: The central ramp into the tunnel has been removed, it's only a hole now. Additionally, the lower two central flag spawns have been moved under the tunnel holes, as you have to turn around to score the flag from them now.
Update 2021-12-15 (again): Another layout change: the center reset block under the default flag spawn is gone - you can no longer drive below that spawn without entering the tunnel area. There are two new ones, one on each side of where the old one was. Additionally, the goals have been rotated - you should no longer have issues running into the finish and bouncing out.
Update 2021-12-16: The tunnel connecting the two sides is gone. There is now a tunnel on each side. Additionally, underneath the center flag spawn is now drivable again, but there is a engine off block. Other blocks are re-arranged accordingly.