It's good to use `data-*` attributes for this kind of thing. I would highly recommend avoiding generic names like `data-request-url` in favor of something more explicit. You are generating two different heat maps:

1. Stops
2. Driving

This feels like two explicitly named attributes would be better:

<!-- language: lang-html -->

    <div id="map"
         data-heatmap-stops-url="@Url.Action(...)"
         data-heatmap-driving-url="@Url.Action(...)">
    </div>

Now looking at your HTML source code will give you a better idea about what these custom attributes mean.