I can understand why they did it this way here.
It’s right at the end of the Willis Way platform. Other areas do not have the Radar sensor and are presumably triggered instantly by the inductive presence detector loops in the ground. That won’t work, here, or when an LRV is stopped at the station, the sign would be illuminated the entire time, which imposes an unnecessary restriction on traffic.
How could the system you propose know when a train is about to start moving and turn on the signal?
That’s why they did it this way.
At a glance it might seem they could just Boolean “AND” the inductive track loop and the radar sensor - train must be present AND moving to turn on the light.
Bit, you are also assuming everything is all integrated and so on as one massive system. For all we know, there’s 24V going up to that mast and that’s it, it could be a self-contained thing operating in isolation. There are a billion reasons why they did what they did, and I’m sure they’ll come up with a simple fix.
Automation is never as simple as “why didn’t they just...”
It’s right at the end of the Willis Way platform. Other areas do not have the Radar sensor and are presumably triggered instantly by the inductive presence detector loops in the ground. That won’t work, here, or when an LRV is stopped at the station, the sign would be illuminated the entire time, which imposes an unnecessary restriction on traffic.
How could the system you propose know when a train is about to start moving and turn on the signal?
That’s why they did it this way.
At a glance it might seem they could just Boolean “AND” the inductive track loop and the radar sensor - train must be present AND moving to turn on the light.
Bit, you are also assuming everything is all integrated and so on as one massive system. For all we know, there’s 24V going up to that mast and that’s it, it could be a self-contained thing operating in isolation. There are a billion reasons why they did what they did, and I’m sure they’ll come up with a simple fix.
Automation is never as simple as “why didn’t they just...”