He is still likely to be close to home, esp as he is used to be inside.

If he is scared he will hide and not respond even to your calls.

But being outside is NOT a death sentence, I realise your honey is safer indoors but he can and will survive. Even inside cats have a flee response from danger & a natural fear of traffic.

My friends let out her 8 weeks kittens out on a very busy road But they are fine healthy 1 year olds now.

Try not to worry... Chances are he is very close to home.

Eli.... Go home baby, your meiowmy is worried.