// join r0 and r1 so vehicles move from r0 to r1
// lane1 of r0 joins to lane1 of r1
// lane2 of r0 joins to lane2 of r1
// lane3 of r0 has no successor
Link.addJoin(r0, r1);
assertEquals(Lanes.LANE1, r1.sourceLane(Lanes.LANE1));
assertEquals(Lanes.LANE2, r1.sourceLane(Lanes.LANE2));
final double lengthCar = 6.0;
final double minimumGap = 2.0;
// final double tooSmallGap = 1.0;
final double safeDeceleration = 4.0;