Lynn, I wouldn't think so, as they would not be able to move far, within the crate.
There is no foolproof safety measure for all cases. Some will argue that a meatal crate is more protection than a seatbelt, while others will claim that a crate could be partially crushed, so the doors won't open.
Humans have lost their lives because they Hve been thrown from a vehicle, because they had no seat belt, while others were unable to escape because they were wearing one. There was a tragic tale of a small boy, who was actually killed by his lap belt, in a very minor crash.
Police in stab vests have been shot and those in bulletproof vests stabbed. There's always the exception, making people think 'what if...' but we have to take the best precautions we can and then trust in providence.
I use a harness when transporting one, or two dogs locally and a metal crate when taking two on a longer trip. Monty, has to go on a harness, as he doesn't like crates and would need a huge one anyway. The car has a split backseat, so all can be accommodated.
Barbara, Monty, Joly and Teddy.