perfect is the enemy of good TPWS was always a stopgap (rolled out in the 90s while ETCS was being developed); as I said it was cheap and easy to deploy, and h

perfect is the enemy of good TPWS was always a stopgap (rolled out in the 90s while ETCS was being developed); as I said it was cheap and easy to deploy, and has prevented many accidents exactly like this one for 25 years ETCS does what you are describing, and has been live in the UK and Europe since the early 00s it works, and is slowly being rolled out everywhere replacing TPWS so, again, why re-invent the wheel? even the Chinese are adopting it