On rails, how can I send an AJAX request without? in the data?

I'm trying to send a request GETto my controller /routes/, so I can get some data back, right now I have

function fetchMarker(id) {
    var data;
    $.ajax({
        type: "GET",
        url: '/routes/',
        data: id,
        dataType: "JSON",
        success: function(data) {
            console.log(data)
        }
    });
}

But the problem is when I do this, Firebug tells me:

"NetworkError: 404 Not Found - http://10.0.0.24:3000/routes/?15"

I believe this is caused ?, I recently switched to Ruby on Rails, so I don’t know if this is normal, but the rake routes tell me that it should be / routes / (params [: id]), so I accept identification number only.

My controller:

def show
    @route = Route.find(params[:id])
    respond_to do |format|
        format.html
        format.json { render json: @route }
    end

end

Thanks pending!