Why doesn't ode stop when value equals zero ?

I'm working on a project for the University. I decided to use an event with ode15s solver : This solver simulates the speed and position of a car and the event makes the simulation stop as the car reaches the speed limit on a road. This solver is inside a for loop, simulating a different part of the road.

    Options=odeset('Events',@eventfunction);

    [T,Y,TE,YE,IE] = ode15s(@odefun,tspan,init,Options,indice,Theta,Omega,Cmax,Fmot,vref,l,lparcourue,Rho,S,Cx,f0,f2,mveh,g,atrans,btrans)

The event function's code is

function [value,isterminal,direction]=eventfunction(t,variables,indice,Theta,Omega,Cmax,Fmot,vref,l,lparcourue,Rho,S,Cx,f0,f2,mveh,g,atrans,btrans)

      value=variables(2)-vref;
      isterminal=1;
      direction=0;
      if(variables(1)>lparcourue+l)
          value=0;
      end

end

And odefun is defined as :

function derivee = odefun(t,variables,indice,Theta,Omega,Cmax,Fmot,vref,l,lparcourue,Rho,S,Cx,f0,f2,mveh,g,atrans,btrans)

      v = variables(2);

      F1 = Fmot;

      F2 = Faero(Rho,S,Cx,v);

      F3 = Frlt(f0,f2,mveh,g,Theta,v);

      F4 =Fgrav(mveh,g,Theta);

      M = me(atrans,btrans,indice,mveh);

      derivee = zeros(2,1);

      derivee(1) = v;

      derivee(2) = (F1-F2-F3-F4)/M;

end

For the first loop, everything is OK, but during the second loop, when the speed remains the same and the solver should stop imediately, it doesn't. I first tough my value had no zero, but after removing the semicolon after "value=..." I had :

value =

       0

value =

       0

value =

       0

value =

       0

value =

       0

value =

       0

value =

       0

value =

       0

value =

       0

value =

       0

value =

       0

T =

    1.0e+005 *

      0.0000
      0.1000
      0.2000
      0.3000
      0.4000
      0.5000
      0.6000
      0.7000
      0.8000
      0.9000
      1.0000

Y =

    1.0e+006 *

      0.0008    0.0000
      0.1396    0.0000
      0.2785    0.0000
      0.4174    0.0000
      0.5563    0.0000
      0.6952    0.0000
      0.8341    0.0000
      0.9730    0.0000
      1.1119    0.0000
      1.2508    0.0000
      1.3896    0.0000

TE =

       []

YE =

       []

IE =

       []

Can anyone explain me what is my error ? Thank you.