Traffic flow London

<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  font: 10px sans-serif;
}

.year {
  font: 500 196px "Helvetica Neue";
  fill: #aaa;
}

.overlay {
  fill: none;
  pointer-events: all;
  cursor: ew-resize;
}

.q0-9 { fill:rgb(247,251,255); }
.q1-9 { fill:rgb(222,235,247); }
.q2-9 { fill:rgb(198,219,239); }
.q3-9 { fill:rgb(158,202,225); }
.q4-9 { fill:rgb(107,174,214); }
.q5-9 { fill:rgb(66,146,198); }
.q6-9 { fill:rgb(33,113,181); }
.q7-9 { fill:rgb(8,81,156); }
.q8-9 { fill:rgb(8,48,107); }

</style>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/queue-async/1.0.7/queue.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.min.js"></script>
<script>

var width = 960,
    height = 700;

var quantile = d3.scale.quantile()
    .range(d3.range(9).map(function(i) { return "q" + i + "-9"; }));

var path = d3.geo.path()
    .projection(null);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

var label = svg.append("text")
    .attr("class", "year")
    .attr("text-anchor", "middle")
    .attr("y", height - 24)
    .attr("x", width/2)
    .text(1993);

var box = label.node().getBBox();

var yearScale = d3.scale.linear()
    .domain([1993,2014])
    .range([box.x + 10, box.x + box.width - 10])
    .clamp(true);
var yearDomain = d3.range(1993,2014);

queue()
    .defer(d3.json, "borough.json")
    .defer(d3.csv, "flows.csv")
    .await(ready);

function ready(error, borough,flows) {
  if (error) throw error;
  
  quantileDomain = [];
  flows.forEach(function(d){ 
    yearDomain.forEach(function (year) { 
      quantileDomain.push(+d[year]); 
    });
  });
  quantileDomain.sort(d3.ascending);
  quantile.domain(quantileDomain);

var overlay = svg.append("rect")
      .attr("class", "overlay")
      .attr("x", box.x)
      .attr("y", box.y)
      .attr("width", box.width)
      .attr("height", box.height)
      .on("mouseover", enableInteraction);

svg.transition()
      .duration(15000)
      .ease("linear")
      .tween("year", tweenYear)
      .each("end", enableInteraction);

function tweenYear() {
    var year = d3.interpolateNumber(1993, 2014);
    return function(t) { displayYear(year(t)); };
  };

function enableInteraction() {
    svg.transition().duration(0);
    overlay
      .on("mousemove", mousemove)
      .on("touchmove", mousemove);
    function mousemove() {
      displayYear(Math.round(yearScale.invert(d3.mouse(this)[0])));
    }
  };

};

d3.select(self.frameElement).style("height", height + "px");

</script>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js

https://cdnjs.cloudflare.com/ajax/libs/queue-async/1.0.7/queue.min.js

https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.min.js