SCP-YYYY "The 16 Wheels That Could."

Item #: SCP-YYYY

Obect Class: Keter

Special Containment Procedures: SCP-YYYY is to be monitored via satelite for any significant changes from its predetermined path or velocity. The Overseer Council is immediately to be notified if any deviations higher then 0,5% occur.
At the beginning of every second month the activity of SCP-YYYY-2 is to be screened via mobile X-ray-scanner and documented. All radio devices are to be turned off while in proximity to SCP-YYYY.
As of Test YYYY-11 any testing regarding SCP-YYYY or SCP-YYYY-1 requires a majority vote of the Overseer Council.

A typical X-ray image of SCP-YYYY-1 with SCP-YYYY-2 (sitting right), SCP-YYYY-3 (sitting left) and SCP-YYYY-4 (leaning on its upper arms against the wall of SCP-YYYY-1)

Description: SCP-YYYY is a █████████ semi-truck¹ transporting a ██ x ██x ██ shipping contrainer, which is referred as SCP-YYYY-1. SCP-YYYY is driving in a circle on the Australian highway network "Highway 1" while ocassionaly moving on adjacent roads. SCP-YYYY follows a specific path which is repeated periodically with a period time of exactly ███ days². At no point of this pattern SCP-YYYY goes below ██ km/h.
As of 04.03.2019 no form form of obstacle, such as traffic, weather, road constructions or willful interventions, has been able to prevent or alter its path. The same applies to attempts to enter or damage SCP-YYYY and SCP-YYYY-1. It is unknown if this protection is a result of the specific path or a direct manipulation of causality through small changes in the environment³ but it is implied that it's the former one.
SCP-YYYY is impervious to any form of electromagnetic radiation with the windows appearing almost perfectly black. Thereby it is unknown if the vehicle is maned and how it is able to drive without the need to refuel⁴. SCP-YYYY seems to be constantly in mint condition with no signs of damage or rust. Futhermore any dirt or water seems to be repealed. The same applies to all tires.

SCP-YYYY-1 appears to be a normal steel container. It has none of the anomalous properties of SCP-YYYY besides of the protection mechanism and a slight deviation from baseline hume. SCP-YYYY has signs of wear, which mostly consist of rust, dirt and a faded logo, which appears to be from [REDACTED]. The doors are locked with a standard container lock whose keyhole has been welded shut.

In contrast to SCP-YYYY the contents of SCP-YYYY-1 can be examined with the help of a purpose-built mobile X-ray-scanner.
The only thing inside of SCP-YYYY-1 are three humanoid figures, designated as SCP-YYYY-2 to 4. All of them appear to be either made up of a very heavy material⁵ or absorb X-ray radiation through anomolous means, as almost no radiation is passing through them during the scanning. SCP-YYYY-2 shows no significant external anatomical differences from normal humans, being around 1.65 m high and showing male genitalia and stature. SCP-YYYY-3 stands at around 1.57 m and despite lacking visible genitalia shows a stature and secondary characteristics of an male. SCP-YYYY-4 is likewise lacking genitalia and is abnormally large, estimated 3.23 m. It also has two growths on its back appearing to be stumps of additional limbs. Most of the time the instances can be found in a sitting position looking down at the floor. Occasionally they can be seen standing or unsucessfully tryng to open the container door and breaking through the container walls.
The entities emit a radio signal at a frequency of [EXPUNGED] which causes [EXPUNGED]. As the frequency lies in a region not commonly used by civilians it is deemed a low risk. Nonetheless Foundation personnel studying the object in close proximity are advised to deactivate any radio devices to avoid accidental exposure.

SCP-YYYY was discovered when an embed agent in the Australian Federal Police heard a rumor of a "ghost truck" with the unregistered license plate number [REDACTED], which allegedly many have seen but none were able to catch. After SCP-YYYY and its anomalous properties were discovered its licence plate number was registered as a military transporter. Any other interferences are currently selfcontaining.

Addendum YYYYa: Test Log excerpt⁶:

Show log

Test	Proposition	Results	Notes
Test YYYY-1:	Initial discovery. Agent ██████ was supposed to enter SCP-YYYY from the cargo box of a adjecent driving pickup-truck	While climbing over the box Agent ██████ lost balance due to inexperience with such situations and fell on to the road. He only sustained some small fractures due to the relatively slow movement speed of ██ km/h and recovered sucessfully.	Initial discovery. Exact anomalous properties not yet discovered.
Test YYYY-2:	Repeated attempt to highjack SCP-YYYY with multiple different personnel	9 out of 11 of the suitable personnel were not able to accept the mission due to unrelated events like reasignment, illnesses and death. Remaining two attempts failed too. One of them because the Foundation vehicle was stolen at a gas station, the other was because of a traffic jam.	Main anomalous properties established.
Test YYYY-4:	The road before SCP-YYYY was supposed to be closed to the public and with the help of spike strips it was supposed to be halted.	SCP-YYYY detoured from the expected path.	Provisional assessment that SCP-YYYY reacts to its environment before the periodic path was discovered which includes this detour.
Test YYYY-7:	SCP-YYYY-1's lock was supposed to be cut.	A drunk driver crashed into the Foundation vehicle, what subsequently led to a multiple-vehicle collision. The death toll was at 14 including the Foundation personnel.	The first attempt to directly acess the container and the first documented deaths involving SCP-YYYY. Implication that the protection mechanism is foremost to prevent access to SCP-YYYY-2 to 4.
Test YYYY-11:	A large portion of the projected path was supposed to be closed and multiple section are to be be made unusable by multiple teams with the help of excavators, explosives and barricades.	SCP-████ breached containment at the adjacent Site-██ when Test YYYY-11 was supposed to start. This resulted in [REDACTED]. All in Test YYYY-11 involved personnel has to be recalled. Death toll of the event lies currently at ████.	All tests currently forbidden by the decision of the O5-Council.

Addendum YYYYa: Futher discoveries:

Content locked by order of the Overseer Council.

During a routine check of SCP-YYYY-2 Assistant Researcher ███████ discovered that SCP-YYYY is emitting a very weak radio signal at a frequency of around 78.4 kHz. It contains a cryptic number message which has been deteremined to be a Foundation vehicle designation marker which was used to get access to facilities (these haven't been used for 74 years as they are currently tracked via satelites). According to it, SCP-YYYY belongs to the Department of Abnormalities and is transporting [EXPUNGED].
Assistant Researcher ███████ and the personnel involved in the decryption of the signal have been amnesticised. The use of any form of radio equipment is to be forbidden during the routine checks with the coverup story of a cognitohazardous radio message.
A redesignation of the item class to Archon and declassification of Addendum YYYYa to Level 4 personnel was proposed by O5-█. Proposal was denied by a majority of the Council (2 yea, 9 nay, 2 abstain).

Footnotes

1. According to ███████ management this model was in planing but was discontinued for a less expensive design.

2. See Document YYYY-██████ for the fully documented path.

3. Possible relations to similarly behaving objects like SCP-988 and SCP-2820 are investigated.

4. Analysis of the exhaust fumes shows no difference in the composition in comparison to conventional diesel engines.

5. No significant Gamma radiation could be detected, ruling out this case.

6. For full Test Log see Document YYYY-██████