if (instance_exists(obj_caterpillarchara))
{
    with (obj_caterpillarchara)
    {
        if (other.susie == 0)
        {
            if (name == "susie")
                other.susie = id;
        }
        if (other.ralsei == 0)
        {
            if (name == "ralsei")
                other.ralsei = id;
        }
    }
}
if (instance_exists(obj_traffic_road_trigger))
{
    with (obj_mainchara)
    {
        if (place_meeting(x, y, obj_traffic_road_trigger))
            other.onroad = true;
        else
            other.onroad = false;
    }
}
if (onroad == true)
{
    if (i_ex(ralsei))
    {
        if (ralsei.image_alpha > 0)
            ralsei.image_alpha -= 0.1;
    }
    if (i_ex(susie))
    {
        if (susie.image_alpha > 0)
            susie.image_alpha -= 0.1;
    }
}
if (onroad == false)
{
    if (i_ex(ralsei))
    {
        if (ralsei.image_alpha < 1)
            ralsei.image_alpha += 0.1;
    }
    if (i_ex(susie))
    {
        if (susie.image_alpha < 1)
            susie.image_alpha += 0.1;
    }
}
if (!i_ex(obj_traffic_road_trigger))
{
    if (instance_exists(obj_caterpillarchara))
    {
        with (obj_caterpillarchara)
        {
            if (image_alpha < 1)
                image_alpha += 0.1;
        }
    }
}