The fracture morphology of bitumen/polymer blends has been characterized using cryo-scanning electron microscopy. This low-temperature technique has extended observations using environmental electron scanning electron microscopy (ESEM) and fluorescence microscopy to a much higher resolving power. Polymer dispersion has been imaged at a submicrometer scale. For each type of bitumen/polymer blend, the characterization of the distribution of the polymer nanoparticles across the fracture surface provides greater understanding of the crack propagation mechanism controlling the fracture properties.