The traffic layer does update itself just as on the Google Maps website. I don’t know how long the update interval is, but it’s as good as it gets. Google does not provide any APIs for the traffic layer.

Could someone test the changes from my fork? I have no time to test this on my mirror right now and I’m afraid there could be errors in the code:
https://github.com/Osyris187/MMM-GoogleMapsTraffic

Ok, I’m at it.

I can do that, but the Git seems to be locked so I can’t make branches. Also, there seems to be another user who forked your Git and added a night mode.

@knubbl See line 4 in the old code of my code snippet above. You can simply adjust the ‘zoom’ parameter: smaller numbers to zoom out, bigger numbers to zoom in.

Hey guys, I figured it’s easy enough to style the map by editing the JS file. So in order to get the night mode as shown in pflodo’s post (and to disable the UI buttons) I added the following to the JS code:

//original code
        script.onload = function () {
            var map = new google.maps.Map(document.getElementById("map"), {
            	zoom: 10,
            	center: {
            		lat: lat,
            		lng: lng
            	},
//add a comma after the } above
//new code:
		disableDefaultUI: true,
		styles: [
			{elementType: 'geometry', stylers: [{color: '#242f3e'}]},
			{elementType: 'labels.text.stroke', stylers: [{color: '#242f3e'}]},
			{elementType: 'labels.text.fill', stylers: [{color: '#746855'}]},
			{
			    featureType: 'administrative.locality',
			    elementType: 'labels.text.fill',
			    stylers: [{color: '#d59563'}]
			},
			{
				featureType: 'poi',
				elementType: 'labels.text.fill',
				stylers: [{color: '#d59563'}]
			},
			{
				featureType: 'poi.park',
			        elementType: 'geometry',
			        stylers: [{color: '#263c3f'}]
			},
			{
				featureType: 'poi.park',
				elementType: 'labels.text.fill',
				stylers: [{color: '#6b9a76'}]
			},
			{
				featureType: 'road',
				elementType: 'geometry',
				stylers: [{color: '#38414e'}]
			},
			{
				featureType: 'road',
				elementType: 'geometry.stroke',
					  stylers: [{color: '#212a37'}]
			},
			{
				featureType: 'road',
				elementType: 'labels.text.fill',
					  stylers: [{color: '#9ca5b3'}]
			},
			{
				featureType: 'road.highway',
				elementType: 'geometry',
				stylers: [{color: '#746855'}]
			},
			{
				featureType: 'road.highway',
				elementType: 'geometry.stroke',
				stylers: [{color: '#1f2835'}]
			},
			{
				featureType: 'road.highway',
				elementType: 'labels.text.fill',
				stylers: [{color: '#f3d19c'}]
			},
			{
				featureType: 'transit',
				elementType: 'geometry',
				stylers: [{color: '#2f3948'}]
			},
			{
			        featureType: 'transit.station',
				elementType: 'labels.text.fill',
				stylers: [{color: '#d59563'}]
			},
			{
			        featureType: 'water',
			        elementType: 'geometry',
				stylers: [{color: '#17263c'}]
			},
			{
				featureType: 'water',
				elementType: 'labels.text.fill',
				stylers: [{color: '#515c6d'}]
			},
			{
				featureType: 'water',
				elementType: 'labels.text.stroke',
				stylers: [{color: '#17263c'}]
			}
		]
//old code again
            });

Have fun!

Also, if you want to make the background black (so it looks cool on the mirror), set the first attribute ‘geometry’ to ‘#000000’.