Not necessarily at the exit.

Normal signal: train stops if there's a train in the section ahead (or it's reserved for another train on a conflicting path), otherwise train goes.

Chain signal: train stops here until it can get a mutex on a path past another non-chain signal.

So if you have rail sections (small letters) and signals (capitals) a - A - b - B - c - C - d in a row on a plain line and A/B are chain signals and C is regular, then trains from the left will stop at A until the train can grab all sections b, c, d in one go.

That's why chain signals at the entrance to a junction are good (prevents a train stopping on the junction) but you want regular ones at the exit, at least if some plain line follows.