SAMP Wheelchair riding script

#include <a_samp>

new playerWheelchair[MAX_PLAYERS];

public OnPlayerCommandText(playerid, cmdtext[])
{
    if(!strcmp(cmdtext, "/sit", true))
    {
        ApplyAnimation(playerid, "PED", "SEAT_IDLE", 4.1, 0, 0, 0, 1, 0, 1);
        SetPlayerAttachedObject(playerid,0,1369,1,-0.276000,0.089999,-0.011999,178.699661,92.599975,3.100000,0.876001,0.734000,0.779000);
        playerWheelchair[playerid]=1;
        return 1;
    }
    if(!strcmp(cmdtext, "/off", true))
    {
        ApplyAnimation(playerid, "PED", "SEAT_UP", 4.0, 0, 0, 0, 0, 0, 1);
        RemovePlayerAttachedObject(playerid , 0);
        playerWheelchair[playerid]=0;
        return 1;
    }
    return 0;
}

stock SetPlayerForwardVelocity(playerid, Float:Velocity, Float:Z)
{
    if(!IsPlayerConnected(playerid)) return 0;

    new Float:Angle;
    new Float:SpeedX, Float:SpeedY;
    GetPlayerFacingAngle(playerid, Angle);
    SpeedX = floatsin(-Angle, degrees);
    SpeedY = floatcos(-Angle, degrees);
    SetPlayerVelocity(playerid, floatmul(Velocity, SpeedX), floatmul(Velocity, SpeedY), Z);

    return 1;
}

public OnPlayerConnect(playerid)
{
    playerWheelchair[playerid]=0;
    return 1;
}

public OnPlayerUpdate(playerid)
{
    if(playerWheelchair[playerid] == 1)
    {


        new Float:a;
        new Keys,ud,lr;
        GetPlayerKeys(playerid,Keys,ud,lr);
        if(ud < 0)
        {

            SetPlayerForwardVelocity(playerid, 0.16, -0.03);

        }
        if(ud > 0)
        {

            SetPlayerForwardVelocity(playerid, -0.16, -0.03);

        }
        if(lr > 0)
        {

            GetPlayerFacingAngle(playerid, a);
            SetPlayerFacingAngle(playerid, a-10);

        }
        if(lr < 0)
        {

            GetPlayerFacingAngle(playerid, a);
            SetPlayerFacingAngle(playerid, a+10);

        }
    }

    return 1;
}