Car traffic in the East Midlands from 2007 to 2011

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		<title>Car traffic in the East Midlands from 2007 to 2011</title>
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	<body>

<h1>Car traffic in the East Midlands from 2007 to 2011</h1>

<p>Traffic counts are averages given for 12 hours of a day from 7am to 6pm. Source: <a href="https://data.gov.uk/dataset/gb-road-traffic-counts/resource/8d49272c-e525-495e-a60c-a93d62aedd6e">gov.uk</a></p>

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var dateFormat = d3.time.format("%d");

var xScale = d3.time.scale()
								.range([ padding[3], w/2 - padding[1] - padding[3] ]);
			
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								.range([h - padding[2], padding[0]]);	
								
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							.ticks(12)
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			.x(function(d) {
			return xScale(dateFormat.parse(d.hours));
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			.y(function(d) {
			return yScale(+d.amount);
			});
			
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d3.csv("car traffic 2007-2011.csv", function(data) {
			
				var hours = ["7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18"];

var dataset = [];

//Loop once for each row in data
				for (var i = 0; i < data.length; i++) {

dataset[i] = {
						year: data[i].Year,
						count: []
					};

//Loop through all the hours
					for (var j = 0; j < hours.length; j++) {

// If value is not empty
						if (data[i][hours[j]]) {

dataset[i].count.push({
								hours: hours[j],
								amount: data[i][hours[j]]
							});
						}

}

}
				
				xScale.domain([ d3.min(hours, function(d) {
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				, d3.max(hours, function(d) {
					return dateFormat.parse(d);
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yScale.domain([ d3.min(dataset, function(d) {
					return d3.min(d.count, function(d) {
					return +d.amount;
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					return d3.max(d.count, function(d) {
					return +d.amount;
				}); }) *.01, d3.max(dataset, function(d) {
					return d3.max(d.count, function(d) {
					return +d.amount;
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					return d3.max(d.count, function(d) {
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					if (d.year == "2011") {
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				.attr("transform", "translate(" + (w/3 + padding[3] + padding[1]) + "," + (h/2 + (padding[2] * -1)) + ")")
				.text("Average counts of cars fluctuated in the period from 2007 to 2011.");
				
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				.append("text")
				.attr("transform", "translate(" + (w/3 + padding[3] + padding[1]) + "," + (h/2 + (padding[2] * 0)) + ")")
				.text("However, the hours of highest and lowest traffic stayed very constant.");
				
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				.attr("transform", "translate(" + (w/3 + padding[3] + padding[1]) + "," + (h/2 + (padding[2] * 1)) + ")")
				.text("Of note is the average traffic in 2011, as highlighted in yellow,");
				
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				.text("which decreased from the 2009 and 2010 levels.");
				
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