def vehicleTypes2flt(outSTRM, vtIDm):
    """
    Currently, rather a stub than an implementation. Writes the vehicle ids stored
    in the given "vtIDm" map formatted as a .flt file readable by PHEM.

    The following may be a matter of changes:
    - A default map is assigned to all vehicle types with the same probability
    """
    for q in sorted(vtIDm._m):
        print("%s,%s,%s" %
              (vtIDm.g(q), "<VEHDIR>\PC\PC_%s.GEN" % q, 1.), file=outSTRM)