  The purely electroweak process $qq\to qqZ$ (via $t$-channel $\gamma/Z$ or $W$
exchange) provides a copious and fairly clean source of color-singlet exchange
events in $pp$ collisions at the LHC. A judicious choice of phase-space region
allows the suppression of QCD backgrounds to the level of the signal. The
color-singlet-exchange signal can be distinguished from QCD backgrounds by the
radiation patterns of additional minijets in individual events. A rapidity-gap
trigger at the minijet level substantially enhances the signal versus the
background. Analogous features of weak boson scattering events make $Z+2$-jet
events at the LHC an ideal laboratory for investigation of the soft-jet
activity expected in weak-boson scattering events.
