Detector rails still trigger junction changes before a cart actually hits the detector rail. I believe this may be because the "hitbox" for triggering cart interactions may be slightly too large, and thus triggering the detector rail when it is diagonal to it.
RTR
D
R=Rail
T=Turn
D detector rail
When the cart is in the upper left or upper right, the T will flip before it gets to the D.
- duplicates
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MC-868 Detector Rail switches junction before Minecart passes detector (happens only with minecarts of certain speed)
- Open