Fine as they are, but was thinking it'd be neat to see them open and close, and be a bit more unstable. That would give a random factor to their use. Talking about stop light kinda timing, not minutes. Also as it's a type of thing that slowly opens and closes, the more open, the faster travel through it. If it's barely forming, takes awhile...100% open - Beam me up Scotty 8-)

Would be fun to chase down retreating players and they get the red light right as they are about to reach it.  9-)     

On the flip side it would make for some fun - "Woot we made it kid" escapes into lightspeed...as the guy hot on your trail raises his fist in the air shouting "Oh you lucky &*(%^^$!"