A new type of radiation at colliders with short bunches - coherent bremsstrahlung (CBS) - was recently considered. In the present paper, we considered the main characteristics of CBS for the known projects of the e+e--colliders PEP-II, KEK-B, VEPP-4 and DA ΦNE. At this collider it will be emitted dN γ∼(10 7-10 8) dE γ/E γ photons for a single collision in the energy range Eγ≲10 KeV. It seems that CBS can be a potential tool for optimizing collisions and for measuring beam parameters. Indeed, the bunch length σz can be found from the CBS spectrum because critical energy Ec∝1/ σz; the horizontal transverse bunch size σx is related to d Nγ∝1/ σx2. Besides, CBS may be very useful for a fast control over an impact parameter R between the colliding bunch axes because a dependence of d Nγ on R has a very specific behavior.