What's the AS3 equivalent of the following AS2 code? - actionscript-3

Question

I'm trying to translate the following AS2 code into AS3 because I have Adobe Flash CC, which doesn't, as far as I know (from research, trial and error), support AS2 code. Any help would be greatly appreciated...
onClipEvent(load) {
speed = 0;
acceleration = 0.4;
speedDecay = 0.96;
maxSpeed = 10;
backSpeed = 1;
}
onClipEvent(enterFrame) {
if(Math.abs(speed) > 0.3) {
speed *= speedDecay;
}else {
speed = 0;
}
if(Key.isDown(Key.UP)) {
if (Math.abs(speed) >= maxspeed) {
speed += acceleration;
}
}
if(Key.isDown(Key.DOWN)) {
if(speed < 0.5)
speed = -2;
else
speed--;
}
if (Math.abs(speed)> 0.5) {
if (Key.isDown(Key.LEFT)) {
_rotation -= 10;
}
if (Key.isDown(Key.RIGHT)) {
_rotation += 10;
}
}
x = Math.sin(_rotation*(Math.PI/180))*speed;
y = Math.cos(_rotation*(Math.PI/180))*speed*-1;
if (!_root.ground.hitTest(_x+x, _y+y, true)) {
_x += x;
_y += y;
}else {
speed -= speed*1.5;
}
}
This code goes in the Car layer of my car game.

Answer 1

Put this code inside your car's movieclip on frame 1:
var speed: Number = 0;
var acceleration: Number = 0.4;
var speedDecay: Number = 0.96;
var maxSpeed: Number = 10;
var backSpeed: Number = 1;
var pressedKeys: Object = {}
stage.addEventListener(Event.ENTER_FRAME, loop)
stage.addEventListener(KeyboardEvent.KEY_DOWN, keydown)
stage.addEventListener(KeyboardEvent.KEY_UP, keyup)
function keydown(e: KeyboardEvent) {
pressedKeys[e.keyCode] = true
}
function keyup(e: KeyboardEvent) {
if (pressedKeys[e.keyCode]) {
pressedKeys[e.keyCode] = false
}
}
function loop(e: Event) {
if (Math.abs(speed) > 0.3) {
speed *= speedDecay;
} else {
speed = 0;
}
if (pressedKeys[Keyboard.UP]) {
if (Math.abs(speed) >= maxSpeed) {
speed += acceleration;
}
}
if (pressedKeys[Keyboard.DOWN]) {
if (speed < 0.5)
speed = -2;
else
speed--;
}
if (Math.abs(speed) > 0.5) {
if (pressedKeys[Keyboard.LEFT]) {
this.rotation -= 10;
}
if (pressedKeys[Keyboard.RIGHT]) {
this.rotation += 10;
}
}
var vx: Number = Math.sin(this.rotation * (Math.PI / 180)) * speed;
var vy: Number = Math.cos(this.rotation * (Math.PI / 180)) * speed * -1;
if (!MovieClip(root).ground.hitTestPoint(this.x + vx, this.y + vy, true)) {
this.x += vx;
this.y += vy;
} else {
speed -= speed * 1.5;
}
}