function [distance_left,isterminal,direction] = end_of_race_event(t,y)

% the race will go for 1/4 mile
quarter_mile = 402.3; % [m]
% assume that y(2) is the distance traveled
distance_left = quarter_mile - y(2) ;
% this is a terminal event -- the simulation should stop when the car
% reaches a quarter mile
isterminal = 1;
% the direction in which the zero value is crossed does not matter
direction = 0;