Mobile network services are performed at the edge of a mobile data network in a way that is transparent to most of the existing equipment in the mobile data network. A threshold for judging decrease in air-pressure of following wheels is different from a threshold for judging decrease in air-pressure of driving wheels. Examples of a system and a computer program product having instructions stored in a tangible computer-readable storage medium are also provided. Variations of structural peptide sequences in the peptide amphiphile may enable the assembled nanofibers to be reversibly cross-linked for more or less structural stability, or may allow for control of the rate of self-assembly. This invention further relates to compositions containing such compounds and a process for making the compounds.