Here is another 'analogy'. It involves water, a firehose (or pipe), and a source of pressure.
The pressure pushing the water, gravity if a sloped pipe/water tower or a mechanical pump.
Pressure is voltage or potential difference (upper/lower end of the pipe/hose or height of the water tower).
The size of the fire (or, for that matter a garden) hose or of a pipe is comparable to resistance. Smaller hose-pipe is higher resistance. LARGER hose/pipe is lower-less resistance.
The volume of water able to travel through the hose/pipe is comparable to current. Picture / relate the volume of water as the ability to do work. i.e. fill troughs on a water wheel = weight turns the wheel or volume of water available to put out a fire. i.e. a garden hose (no matter the pressure) vs. a 2" fire hose. Electrical current is the capacity to do work, heater, motor, ......... and burn,shock, kill.
REMINDER, the greater the available current (with a sufficient voltage to overcome skin resistance) the more dangerous, but, once the voltage is high enough (70V +/-) to overcome skin resistance, less than one Amp, CAN KILL!
I suspect the vehicle analogy was intended to assist readers to visualize electron movement, but how electrons move, in my opinion, has little to do with current, voltage, and/or resistance.