[GrimR]

If you are not using ZCMD/DCMD then yes OnPlayerCommandText.

pawn Code:

if (!strcmp(cmdtext, "/race", true)) 
  {
    new Float: x, Float: y, Float: z;
       
    GetPlayerPos(GOTOPLAYER, x, y, z);
        
    if (GetPlayerState(playerid) == PLAYER_STATE_DRIVER) { SetVehiclePos(GetPlayerVehicleID(playerid), x, y, z); }
    else { SetPlayerPos(playerid, x, y, z); } 
    return 1;
    }

GETPLAYERPOS would be the ID of the player you want to warp them to. If this is not the case, set the x, y and z values to where you want them to warp in place of GetPlayerPos.