Cars Saying Hello! [Java/Pjs]

mySketch
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/** 
 * Cars Saying Hello! (v2.2.1) [Java/Pjs]
 * by  LightPost101 (2013/Nov)
 * mod GoToLoop
 * 
 * Forum.Processing.org/two/discussion/1250/
 * how-to-draw-an-orange-line-between-cars-
 * when-they-are-4-pixels-horizontally-of-each-other#Item_1
 */
​
final Car car1 = new Car(#FF0000, 150, 30, 3);
final Car car2 = new Car(#00A0FF, 0, 120, 1.5);
​
void setup() {
  size(400, 150);
  rectMode(CENTER);
  strokeWeight(1.5);
}
​
void draw() {
  background(0300);
  stroke(0);
​
  car1.drive();
  car1.display();
​
  car2.drive();
  car2.display();
​
  if (car1.checkHozNear(car2))  car1.drawContactLine(car2);
}
​
final class Car {
  static final short W = 20, H = 10, D = 8;
  static final color LINE_C = #FFA500;
​
  color c;
  float x, y;
  final float spd, slow;
  boolean isNear;
​
  Car(final color cc, final float xx, final float yy, final float ss) { 
    c = cc;
​
    x = xx;
    y = yy;
​
    spd  = ss;
    slow = ss/3;
  }
​
  void drive() {
    if ((x += isNear? slow : spd) > width + W)  x = -W;
  }
​
  void display() { 
    fill(c);
    rect(x, y, W, H);
  }
​
  boolean checkHozNear(final Car other) {
    return other.isNear = isNear = 
      x > other.x - W - D & x < other.x + W + D;
  }
​
  void drawContactLine(final Car other) {
    stroke(LINE_C);
    line(x, y, other.x, other.y);
  }
}