OPINION
MAASSEN, Justice.
I. INTRODUCTION
The owner of a "1972 Noland car" sought to title and register it as a "low-speed vehicle," a special category of vehicles deemed roadworthy under Alaska law. The vehicle lacked a previous title, registration, or any other document from which its compliance with the applicable safety standards could be inferred. A cursory inspection failed to satisfy the Department of Administration, Division of Motor Vehicles (DMV),1 that the vehicle met those standards, and the DMV refused to title and register it as a low-speed vehicle. Following an evidentiary hearing, a hearing officer upheld that decision, which was affirmed again on appeal to the superior court. The owner appeals to this court.
We affirm the superior court's decision to affirm the decision of the hearing officer. We conclude that substantial evidence supported the hearing officer's finding that the vehicle had not been shown to be safe for roadway use and that the decision not to title or register it therefore had a reasonable basis.
II. FACTS AND PROCEEDINGS
Paige Vonder Haar purchased a vehicle from a seller in Oregon in 2007. The parties label the vehicle variously as an "electric car" or a "customized golf cart," depending on their perspective. Paige's husband David testified that it was one of a number of vehicles built by Dale Noland for Disneyland "to move passengers and their luggage from hotels and places in the park." The Vonder Haars were not given any documents of title or registration at the time of purchase, but the bill of sale described it as a "1972 Noland car" (though it appears the vehicle may actually have been manufactured in 1971). The vehicle model was identified as "Ambassador." The vonder Haars intended that their son would use the vehicle "to sell ice cream on the streets in Fairbanks."
Alaska law permits the operation of low-speed vehicles on public roads that have certain speed limits.2 In addition to specifying minimum and maximum speeds for such vehicles,3 Alaska law requires that they meet "weight, equipment, and safety standards set by the [D]epartment [of Administration] by regulation; weight, equipment, and safety standards shall be consistent with, and may not exceed, federal standards."4 The Department of Administration has not promulgated regulations for low-speed vehicles, but federal regulations detail safety standards for them,5 and the parties to this appeal agree that, in the absence of state regulations, state law should be interpreted as incorporating these federal standards.
In 2009 David attempted to title and register the Noland car as a low-speed vehicle. He applied at the DMV office in Fairbanks; because he lacked the usual documentation, a DMV employee inspected the vehicle for compliance with safety standards.
The employee did not find a Vehicle Identification Number (VIN), any indication that the vehicle came from a manufacturer that follows federal safety standards, or any other visible assurance that the vehicle met those standards. David asked for a second inspection. An Alaska State Trooper took a look at the vehicle, noted its lack of doors, opined that "[i]f you got hit in this, you'd be killed," and declared the vehicle unsafe to drive on the road.6 DMV informed the Vonder Haars that the vehicle could not be registered as a low-speed vehicle, though it could be registered for off-road use.
Later in 2009, Paige obtained a surety bond and appraisal for the vehicle and succeeded in having it titled and registered as a low-speed vehicle at a satellite DMV location.7 The satellite location was operated by a private contractor, who did not inspect the Vonder Haars' vehicle for compliance with safety standards.8
In 2010 the Department wrote Paige a letter, informing her that it had cancelled the vehicle's title upon learning that it "may be a customized golf cart" and explaining that "[t]he DMV does not title or register golf carts." The letter informed Paige that she should take the vehicle to the Fairbanks DMV office for an inspection within 15 days. It also informed her that she had a right to an administrative hearing, that she had 15 days in which to ask for one, and that her failure to do so would "waive [her] right to a hearing and the [DMV's] cancellation of the title [would] be affirmed and final." According to David, the Vonder Haars never received the letter. In 2011, however, when the Vonder Haars attempted to renew the vehicle's registration, they were informed that its earlier title and registration had been revoked and that their application for a new title and registration was denied.
The Vonder Haars then requested an administrative hearing, which was held in August 2012. David testified that the vehicle was capable of traveling at a minimum speed of 20 miles per hour and a maximum speed of 25 miles per hour. He testified that the vehicle was equipped with headlights, "stop lamps" (that is, "back lights" that are "like brake lights"), reflectors, exterior mirrors on both sides, a parking brake, seatbelts, and a windshield.
The hearing officer found that the vehicle could not be registered as a low-speed vehicle because the Department had determined it was "unsafe to be driven or moved on a highway." She found "that the cart was not manufactured for highway use based on its custom build, the lack of [a manufacturer's certificate of origin], and the lack of a 17 digit VIN." She further found "that the cart does not meet the requirements to title and registration for purposes of a low-speed cart due to the lack of a known manufacturer." She therefore upheld the Department's revocation of title.
Paige appealed to the superior court, which reviewed the agency's decision under the "reasonable basis" standard, applying the "substantial evidence" standard to the underlying findings of fact. The superior court found that the agency's determination that the Vonder Haars' vehicle did not meet the applicable standards for low-speed vehicles was supported by substantial evidence and the decision not to title and register it was reasonable; it therefore affirmed the hearing officer's decision.
Paige appealed to this court.
III. STANDARDS OF REVIEW
"Where the superior court acts as an intermediate court of appeal for an administrative decision, we directly and independently review the underlying administrative decision, and may affirm the decision below on any ground supported by the record."9
We review factual findings made by an administrative agency using the "substantial evidence" standard, under which "findings will be upheld so long as there is enough relevant evidence to allow a reasonable mind to adequately support such a conclusion."10 "`[W]e will not reweigh conflicting evidence, determine witness credibility, or evaluate competing inferences from testimony,' as these functions are reserved to the agency."11
"We review questions of law involving agency expertise under the reasonable basis test and where no expertise is involved under the substitution of judgment test."12 "When applying the reasonable basis test, we `seek to determine whether the agency's decision is supported by the facts and has a reasonable basis in law, even if we may not agree with the agency's ultimate determination.'"13 "Under the substitution of judgment standard, we may `substitute [our] own judgment for that of the agency even if the agency's decision had a reasonable basis in law.'"14
IV. DISCUSSION
A. Low-Speed Vehicles And Alaska Motor Vehicle Law
Alaska law allows the use of "low-speed vehicles" on public roads with maximum speed limits of 35 or 45 miles per hour depending on location.15 A low-speed vehicle must be "manufactured to be capable of propelling itself and achieving a minimum speed of 20 miles an hour," must not have "been modified to have a maximum speed greater than 25 miles an hour," and must meet "weight, equipment, and safety standards set by the department by regulation[,] . . . [standards that] shall be consistent with, and may not exceed, federal standards."16
The federal safety standards for low-speed vehicles are found at 49 C.F.R. § 571.500.17 The parties agree that these standards apply.18 The federal standards, like Alaska's statute, require that a low-speed vehicle have a maximum speed of not more than 25 miles per hour;19 but unlike Alaska's statute, the federal standards also mandate "[g]eneral test conditions" and procedures under which this maximum speed must be demonstrated.20 Federal standards mandate that low-speed vehicles have certain equipment — such as headlamps, turn signal lamps, and seat belts21 — and they provide detailed specifications for some of these items.22 Federal standards also require that low-speed vehicles have a 17-character VIN.23
Under Alaska law the Department of Administration may refuse to issue a certificate of title or may revoke a previously issued title under certain conditions.24 It may also refuse to issue a vehicle's registration or may revoke a registration for reasons including that "the vehicle is determined to be mechanically unsafe to be driven or moved on a highway, vehicular way or area, or other public property in the state."25
B. The Department's Decision Not To Title And Register The Vonder Haars' Vehicle As A Low-Speed Vehicle Had A Reasonable Basis.
Paige challenges the Department's decision that the vehicle was not eligible for title and registration as a low-speed vehicle.26 She contends that the Department could not lawfully rely on the lack of a VIN, a manufacturer's certificate of origin, and a known manufacturer in denying title and registration. She argues that she produced evidence sufficient to prove compliance with the applicable safety standards and that the hearing officer erred in ruling otherwise.
We conclude that substantial evidence supported the agency's finding that the vehicle was not roadworthy, though not in the way the hearing officer explained.27 In support of her conclusion that the Department properly denied title and registration, the hearing officer found "that the cart was not manufactured for highway use based on its custom build, the lack of [a manufacturer's certificate of origin], and the lack of a 17 digit VIN." She also found that the vehicle could not be titled and registered as a low-speed vehicle "due to the lack of a known manufacturer." But Paige is correct that the law does not require a low-speed vehicle to be "manufactured for highway use," have a manufacturer's certificate of origin, or come from "a known manufacturer." These may be helpful indications that the vehicle meets the applicable safety standards, but it is actual compliance with the safety standards that the law requires. There is nothing in the governing statutes that would prevent a vehicle that complies with the safety standards from being titled and registered as a low-speed vehicle regardless of whether it was "manufactured for highway use," has a manufacturer's certificate of origin, or comes from "a known manufacturer."
A 17-character VIN, on the other hand, is required by the federal low-speed vehicle standards.28 But Alaska law allows for the replacement of missing or altered VINs, so the lack of one does not prevent an owner from ultimately acquiring title and registration.29 Besides, the apparent purpose of a VIN is not to assure compliance with safety standards, but rather "to simplify vehicle identification information retrieval and to increase the accuracy and efficiency of vehicle recall campaigns."30 Here, the evidence showed that the vehicle's manufacture predated the current VIN system but that the vehicle did have a five-digit registration number that could serve the same purposes of identification.31 Under these circumstances, the Department may have acted unreasonably had the only evidence that the vehicle was unsafe been its lack of a VIN.
In other federal standards, however, the regulations require not only that low-speed vehicles have a maximum speed of 25 miles per hour, but also that this be demonstrated under test conditions that are highly specific with regard to ambient temperature, wind speed, road surface, gradient, weight, and tire pressure, among other things.32 Certain pieces of the required safety equipment — such as a windshield and seatbelts — must also conform to very specific safety standards.33
At the administrative hearing, the only evidence presented concerning the vehicle's speed capabilities was David's affirmative answer when his counsel asked him whether the vehicle was "capable of propelling itself and achieving a minimum speed of 20 miles an hour . . . [a]nd a maximum speed of 25 miles an hour." The testimony about the mandatory safety equipment was similarly brief and conclusory. There was no other testimony about the basis for David's conclusions, and no other evidence that the vehicle had been tested under the conditions or in accordance with the exacting procedures that the federal safety standards require.34 In the absence of the usual documents and certifications from which the Department could presume compliance with safety standards, the Department required the Vonder Haars to demonstrate actual compliance with those standards.35 And substantial evidence supports the hearing officer's finding that the Vonder Haars did not carry this burden.36 Because the vehicle's compliance with applicable safety standards had not been satisfactorily demonstrated, there was a reasonable basis for the Department's decision that it could not be titled or registered as a low-speed vehicle.
Paige contends that the administrative decision does not involve agency expertise or fundamental policy questions and that the "substitution of judgment" standard is therefore appropriate for our review. We reject this contention. The substitution of judgment standard is appropriate "where the agency's specialized knowledge and experience would not be particularly probative on the meaning of the statute."37 The reasonable basis standard, in contrast, is appropriate "when the interpretation at issue implicates agency expertise or the determination of fundamental policies within the scope of the agency's statutory functions."38 Clearly, the legislature intended to give the Department some measure of discretion in determining whether a vehicle meets the requirements for titling and registration; the Alaska statutes provide conditions under which the Department "may refuse to register a vehicle"39 and specify that the Department "may refuse to issue a certificate of title."40 And the statute defining "low-speed vehicle" expressly delegates to the Department the authority to set the safety requirements for low-speed vehicles by regulation,41 further acknowledging the role of agency expertise.42 Accordingly, "deference should be granted because the [Department], having specialized knowledge in a field, is in a better position than a court to make such determinations."43 Because "[w]hether the [hearing officer's] findings were sufficient to justify denial [of title and registration] is a question of law involving agency expertise[, w]e apply the reasonable basis test."44
"When applying the reasonable basis test, we `seek to determine whether the agency's decision is supported by the facts and has a reasonable basis in law, even if we may not agree with the agency's ultimate determination.'"45 Alaska Statute 28.10.041(a)(4) provides that the Department "may refuse to register a vehicle if . . . the vehicle is determined to be mechanically unsafe," and AS 28.10.221(a)(1) provides that the Department "may refuse to issue a certificate of title . . . [when] required information. . . [has] not been provided." Because substantial evidence supported the hearing officer's conclusion that the Vonder Haars' vehicle had not been shown to comply with the applicable safety standards, the Department had a reasonable basis under AS 28.10.041 and AS 28.10.221 for its refusal to title and register the vehicle as a low-speed vehicle.46
V. CONCLUSION
The superior court's decision affirming the hearing officer's decision that the Department was not required to title and register the Vonder Haars' vehicle is AFFIRMED.