How do you know for certain that you aren't going to hit something half-down that you can't see from the start and that you are now travelling too fast to avoid?
You don't. You have to have faith in ATC - but without a ground movement radar, ATC also has to have faith in flightcrew following instructions. This is what happens when it all goes wrong:-
ASN Aircraft accident McDonnell Douglas MD-87 SE-DMA Milano-Linate Airport (LIN)