Technically the two switches attached to the voltage source should be a single DPDT switch but there isnt such a thing in every circuit. So what happens on the useless box is the user flicks the switch (in this case both SPDT switches) and which activates the motor on one direction (in this case a light bulb and green led) the arm then moves away from a push switch (i used a SPST switch for ease of demo but technically its a push to break switch or a accident detection switch) which then closes that circuit. The arm then switches off the DPDT switch and then the motor reverses (bulb stays on, green led turns off and red one turns on) until the arm reaches the push to break switch again which is when the motor turns off.
