Transparency improvements to roads on Google Maps

Some small but important improvements have just gone live today:

1. Roads at deep zooms in Hybrid map mode are now less opaque, covering less of the map imagery

2. Tunnels that previously had no fill now also have a transparent fill, making them easier to spot on busy backgrounds

3. Tunnels that previously had a solid fill now have a transparent fill, making them easier to distinguish from above ground roads

Here are some before/after screenshots: