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Cell crawling has usually been characterized by a diffusion constant D and instantaneous velocity<| v→| 2>. However, experimentally<| v→| 2> diverges. A three regime (diffusive-ballistic-diffusive) modified Fürth equation parameterized by D, the dimensionless excess diffusion coefficient S and the persistence time P is compatible with experiment. S allows comparison of trajectories across experiments and sets limits on the intervals and duration of experiments required to assess cell movement. Cell trajectories in a variety of published experiments are consistent with longitudinal Langevin dynamics and a transverse Wiener process with S∼ 1+ c o n s t a n t∗ D− 1.