The ornamental design for vehicle, as shown and described.
FIG. 1 is a perspective view of a vehicle showing our new design in the vehicle's unfolded configuration;
FIG. 2 is a right side elevational view thereof in the vehicle's folded configuration, the left side being substantially a mirror image, the only difference being the location of the handlebar assembly;
FIG. 3 is a front perspective view thereof in the vehicle's folded configuration;
FIG. 4 is a rear perspective view thereof in the vehicle's folded configuration; and,
FIG. 5 is a bottom perspective view thereof in the vehicle's unfolded configuration.