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Transverse hadron spectra from proton-proton, proton-nucleus andnucleus-nucleus collisions from 2 AGeV to 21.3 ATeV are investigated within twoindependent transport approaches (HSD and UrQMD). For central Au+Au (Pb+Pb)collisions at energies above $E_{\rm lab}\sim$ 5 AGeV, the measured $K^{\pm}$transverse mass spectra have a larger inverse slope parameter than expectedfrom the default calculations. The additional pressure - as suggested bylattice QCD calculations at finite quark chemical potential $\mu_q$ andtemperature $T$ - might be generated by strong interactions in the earlypre-hadronic/partonic phase of central Au+Au (Pb+Pb) collisions. This issupported by a non-monotonic energy dependence of $v_2/< p_T>$ in the presenttransport model.Comment: Proceedings of Strange Quark Matter 200

Transverse pressure and strangeness dynamics in relativistic heavy-ion reactions