Function RoadVehCheckOvertake

src/roadveh_cmd.cpp:807–857

}

static void RoadVehCheckOvertake(RoadVehicle *v, RoadVehicle *u)
{
	OvertakeData od;

	od.v = v;
	od.u = u;

	/* Trams can't overtake other trams */
	if (RoadTypeIsTram(v->roadtype)) return;

	/* Don't overtake in stations */
	if (IsTileType(v->tile, MP_STATION) || IsTileType(u->tile, MP_STATION)) return;

	/* For now, articulated road vehicles can't overtake anything. */
	if (v->HasArticulatedPart()) return;

	/* Vehicles are not driving in same direction || direction is not a diagonal direction */
	if (v->direction != u->direction || !(v->direction & 1)) return;

	/* Check if vehicle is in a road stop, depot, tunnel or bridge or not on a straight road */
	if (v->state >= RVSB_IN_ROAD_STOP || !IsStraightRoadTrackdir((Trackdir)(v->state & RVSB_TRACKDIR_MASK))) return;

	/* Can't overtake a vehicle that is moving faster than us. If the vehicle in front is
	 * accelerating, take the maximum speed for the comparison, else the current speed.
	 * Original acceleration always accelerates, so always use the maximum speed. */
	int u_speed = (_settings_game.vehicle.roadveh_acceleration_model == AM_ORIGINAL || u->GetAcceleration() > 0) ? u->GetCurrentMaxSpeed() : u->cur_speed;
	if (u_speed >= v->GetCurrentMaxSpeed() &&
			!u->vehstatus.Test(VehState::Stopped) &&
			u->cur_speed != 0) {
		return;
	}

	od.trackdir = DiagDirToDiagTrackdir(DirToDiagDir(v->direction));

	/* Are the current and the next tile suitable for overtaking?
	 *  - Does the track continue along od.trackdir
	 *  - No junctions
	 *  - No barred levelcrossing
	 *  - No other vehicles in the way
	 */
	od.tile = v->tile;
	if (CheckRoadBlockedForOvertaking(&od)) return;

	od.tile = v->tile + TileOffsByDiagDir(DirToDiagDir(v->direction));
	if (CheckRoadBlockedForOvertaking(&od)) return;

	/* When the vehicle in front of us is stopped we may only take
	 * half the time to pass it than when the vehicle is moving. */
	v->overtaking_ctr = (od.u->cur_speed == 0 || od.u->vehstatus.Test(VehState::Stopped)) ? RV_OVERTAKE_TIMEOUT / 2 : 0;
	v->overtaking = RVSB_DRIVE_SIDE;
}

static void RoadZPosAffectSpeed(RoadVehicle *v, int old_z)
{