diff --git a/js/main.js b/js/main.js
index 79da464..2693318 100644
--- a/js/main.js
+++ b/js/main.js
@@ -22,8 +22,14 @@ var f1data = {
 // data/circuits.csv
 function fetchCircuits(callback) {
   d3.csv('data/circuits.csv', function(data) {
-    // TODO: process data
-    f1data.circuits = data;
+    // preprocess data
+    data.forEach(function(d, i) {
+      d["circuitId"] = parseInt(d["circuitId"]);
+      d["lat"] = parseFloat(d["lat"]);
+      d["lng"] = parseFloat(d["lng"]);
+      d["alt"] = parseInt(d["alt"]);
+    });
+    f1data.circuits = data; // Store results
     callback(null); // Tell the queue we're done.
   });
 }
@@ -31,8 +37,15 @@ function fetchCircuits(callback) {
 // data/constructorResults.csv
 function fetchConstructorResults(callback) {
   d3.csv('data/constructorResults.csv', function(data) {
-    // TODO: process data
-    f1data.constructorResults = data;
+    // preprocess data
+    data.forEach(function(d, i) {
+      d["constructorId"] = parseInt(d["constructorId"]);
+      d["constructorResultsId"] = parseInt(d["constructorResultsId"]);
+      d["points"] = parseInt(d["points"]);
+      d["raceId"] = parseInt(d["raceId"]);
+      d["status"] = parseInt(d["status"]);
+    });
+    f1data.constructorResults = data; // Store results
     callback(null); // Tell the queue we're done.
   });
 }
@@ -40,7 +53,10 @@ function fetchConstructorResults(callback) {
 // data/constructors.csv
 function fetchConstructors(callback) {
   d3.csv('data/constructors.csv', function(data) {
-    // TODO: process data
+    // preprocess data
+    data.forEach(function(d, i) {
+      d["constructorId"] = parseInt(d["constructorId"]);
+    });
     f1data.constructors = data;
     callback(null); // Tell the queue we're done.
   });
@@ -49,7 +65,15 @@ function fetchConstructors(callback) {
 // data/constructorStandings.csv
 function fetchConstructorStandings(callback) {
   d3.csv('data/constructorStandings.csv', function(data) {
-    // TODO: process data
+    // preprocess data
+    data.forEach(function(d, i) {
+      d["constructorId"] = parseInt(d["constructorId"]);
+      d["constructorStandingsId"] = parseInt(d["constructorStandingsId"]);
+      d["points"] = parseInt(d["points"]);
+      d["position"] = parseInt(d["position"]);
+      d["raceId"] = parseInt(d["raceId"]);
+      d["wins"] = parseInt(d["wins"]);
+    });
     f1data.constructorStandings = data;
     callback(null); // Tell the queue we're done.
   });
@@ -58,7 +82,12 @@ function fetchConstructorStandings(callback) {
 // data/drivers.csv
 function fetchDrivers(callback) {
   d3.csv('data/drivers.csv', function(data) {
-    // TODO: process data
+    // preprocess data
+    data.forEach(function(d, i) {
+      d["dob"] = new Date(d["dob"]);
+      d["driverId"] = parseInt(d["driverId"]);
+      d["number"] = parseInt(d["number"]);
+    });
     f1data.drivers = data;
     callback(null); // Tell the queue we're done.
   });
@@ -67,7 +96,15 @@ function fetchDrivers(callback) {
 // data/driverStandings.csv
 function fetchDriverStandings(callback) {
   d3.csv('data/driverStandings.csv', function(data) {
-    // TODO: process data
+    // preprocess data
+    data.forEach(function(d, i) {
+      d["driverId"] = parseInt(d["driverId"]);
+      d["driverStandingsId"] = parseInt(d["driverStandingsId"]);
+      d["points"] = parseInt(d["points"]);
+      d["position"] = parseInt(d["position"]);
+      d["raceID"] = parseInt(d["raceId"]);
+      d["wins"] = parseInt(d["wins"]);
+    });
     f1data.driverStandings = data;
     callback(null); // Tell the queue we're done.
   });
@@ -76,7 +113,14 @@ function fetchDriverStandings(callback) {
 // data/lapTimes.csv
 function fetchLapTimes(callback) {
   d3.csv('data/lapTimes.csv', function(data) {
-    // TODO: process data
+    // preprocess data
+    data.forEach(function(d, i) {
+      d["driverId"] = parseInt(d["driverId"]);
+      d["lap"] = parseInt(d["lap"]);
+      d["milliseconds"] = parseInt(d["milliseconds"]);
+      d["position"] = parseInt(d["position"]);
+      d["raceId"] = parseInt(d["raceId"]);
+    });
     f1data.lapTimes = data;
     callback(null); // Tell the queue we're done.
   });
@@ -85,7 +129,15 @@ function fetchLapTimes(callback) {
 // data/pitStops.csv
 function fetchPitStops(callback) {
   d3.csv('data/pitStops.csv', function(data) {
-    // TODO: process data
+    // preprocess data
+    data.forEach(function(d, i) {
+      d["driverId"] = parseInt(d["driverId"]);
+      d["duration"] = parseFloat(d["duration"]);
+      d["lap"] = parseInt(d["lap"]);
+      d["milliseconds"] = parseInt(d["milliseconds"]);
+      d["raceId"] = parseInt(d["raceId"]);
+      d["stop"] = parseInt(d["stop"]);
+    });
     f1data.pitStops = data;
     callback(null); // Tell the queue we're done.
   });
@@ -94,7 +146,18 @@ function fetchPitStops(callback) {
 // data/qualifying.csv
 function fetchQualifying(callback) {
   d3.csv('data/qualifying.csv', function(data) {
-    // TODO: process data
+    // preprocess data
+    data.forEach(function(d, i) {
+      d["constructorId"] = parseInt(d["constructorId"]);
+      d["driverId"] = parseInt(d["driverId"]);
+      d["number"] = parseInt(d["number"]);
+      d["position"] = parseInt(d["position"]);
+      d["q1"] = new Date(d["q1"]);
+      d["q2"] = new Date(d["q2"]);
+      d["q3"] = new Date(d["q3"]);
+      d["qualifyId"] = parseInt(d["qualifyId"]);
+      d["raceId"] = parseInt(d["raceId"]);
+    });
     f1data.qualifying = data;
     callback(null); // Tell the queue we're done.
   });
@@ -103,7 +166,15 @@ function fetchQualifying(callback) {
 // data/races.csv
 function fetchRaces(callback) {
   d3.csv('data/races.csv', function(data) {
-    // TODO: process data
+    // preprocess data
+    data.forEach(function(d, i) {
+      d["circuitId"] = parseInt(d["circuitId"]);
+      d["date"] = new Date(d["date"]);
+      d["raceId"] = parseInt(d["raceId"]);
+      d["round"] = parseInt(d["round"]);
+      d["time"] = new Date(d["time"]);
+      d["year"] = parseInt(d["year"]);
+    });
     f1data.races = data;
     callback(null); // Tell the queue we're done.
   });
@@ -112,7 +183,26 @@ function fetchRaces(callback) {
 // data/results.csv
 function fetchResults(callback) {
   d3.csv('data/results.csv', function(data) {
-    // TODO: process data
+    // preprocess data
+    data.forEach(function(d, i) {
+      d["constructorId"] = parseInt(d["constructorId"]);
+      d["driverId"] = parseInt(d["driverId"]);
+      d["fastestLap"] = parseInt(d["fastestLap"]);
+      d["fastestLapSpeed"] = parseFloat(d["fastestLapSpeed"]);
+      d["fastestLapTime"] = new Date(d["fastestLapTime"]);
+      d["grid"] = parseInt(d["grid"]);
+      d["laps"] = parseInt(d["laps"]);
+      d["milliseconds"] = parseInt(d["milliseconds"]);
+      d["number"] = parseInt(d["number"]);
+      d["points"] = parseInt(d["points"]);
+      d["position"] = parseInt(d["position"]);
+      d["positionOrder"] = parseInt(d["positionOrder"]);
+      d["raceId"] = parseInt(d["raceId"]);
+      d["rank"] = parseInt(d["rank"]);
+      d["resultId"] = parseInt(d["resultId"]);
+      d["statusId"] = parseInt(d["statusId"]);
+      d["time"] = new Date(d["time"]);
+    });
     f1data.results = data;
     callback(null); // Tell the queue we're done.
   });
@@ -121,7 +211,10 @@ function fetchResults(callback) {
 // data/seasons.csv
 function fetchSeasons(callback) {
   d3.csv('data/seasons.csv', function(data) {
-    // TODO: process data
+    // preprocess data
+    data.forEach(function(d, i) {
+      d["year"] = parseInt(d["year"]);
+    });
     f1data.seasons = data;
     callback(null); // Tell the queue we're done.
   });
@@ -130,7 +223,10 @@ function fetchSeasons(callback) {
 // data/status.csv
 function fetchStatus(callback) {
   d3.csv('data/status.csv', function(data) {
-    // TODO: process data
+    // preprocess data
+    data.forEach(function(d, i) {
+      d["statusId"] = parseInt(d["statusId"]);
+    });
     f1data.status = data;
     callback(null); // Tell the queue we're done.
   });