Appellant, Thomas Cook, was found guilty in Natrona County District Court of armed robbery and sentenced to five to seven years in the Wyoming State Penitentiary. Mr. Cook raises two issues challenging the lower court decision.
The first argument charges that an illegal arrest occurred because the police officers lacked probable cause to stop the vehicle in which appellant was riding. Once having established this position, the appellant would invoke the exclusionary rule through the "fruit of the poisonous tree" doctrine for purposes of suppressing all evidence resulting from this initial illegality, thereby challenging the trial court's denial of the motion to suppress.
The second argument urges that appellant has been denied his constitutional right to a speedy trial because of a District Court Rule 22 violation.
*7Because we find the stop reasonable in light of all the circumstances, and no reversible error with regard to the speedy trial question, we will affirm.
THE FACTS
Shortly after midnight, on the 24th of January, 1980, the Best Western East Motel in Casper was robbed of $45 and an unspecified amount of change. The robber was an armed youth with shoulder-length hair. Upon his departure, Lavina Sexton, the night clerk at the motel, notified the police that the gunman was headed east on Yellowstone toward the Red and White Cafe. When a police officer arrived on the scene, it became clear that Ms. Sexton had mistakenly stated "east" when she meant "west" on Yellowstone, nonetheless toward the Red and White Cafe. Lieutenant Dorvola left the dispatch room at the Casper Police Department upon hearing the initial report. Enroute to the scene, he heard the corrected version and also received a brief description of.the suspect, including race, height, clothing and "shoulder-length brown hair parted in the middle." The lieutenant did not go to the scene of the robbery, but proceeded to a spot about one-fourth mile northwest of the motel, and while there he observed a white van coming from a private area, where such a vehicle should not have been at this time of night and under the circumstances existing at this time and place. As the van passed Lieutenant Dor-vola in his car, he observed two people, one of whom was a passenger with shoulder-length hair. Subsequently, the van was stopped by Lieutenant Dorvola and immediately thereafter other officers arrived at the scene. The occupants were asked to remove themselves from the van-which they did-and after which they were subjected to a patdown search. No weapons were discovered but a large amount of change was felt in the passenger's pocket. It was at this juncture that the officers observed that the defendant passenger matched the description given by the motel night clerk. With his "consent," the passenger (appellant) was taken back to the motel and there identified by Ms. Sexton, the night clerk, as the robber. Appellant was then advised that he was under arrest given his Miranda warnings, and removed to the Casper Hall of Justice where he later gave an incriminating statement of confes-gion.
COURSE OF PROCEEDING
Appellant Cook was charged with aggravated robbery in violation of § 6-4-402, W.$.1977,1 on February 6, 1980, following his arrest on January 24, 1980. Appellant was unable to post bond and, pursuant to a request by the county attorney, the trial was set for May 19, 1980. The county attorney thereafter requested a setting of the trial for June 16, 1980. Notice of this setting was issued. A motion to suppress was heard and denied on May 12, 1980. A motion to dismiss for a speedy trial violation was made by appellant on May 21, 1980, which motion was also denied. Mr. Cook was tried before a jury beginning June 16, 1980, as a result of which he was convicted and sentenced.
SUPPRESSION OF THE EVIDENCE
Appeliant urges arrest without probable cause and the violation of his Fourth Amendment rights with the result that evidence was obtained illegally under the "fruit of the poisonous tree" doctrine. An analysis of this issue requires that we look at the stop, the arrest, and the voluntariness of appellant's consent. We must decide if any of these steps produced evidence which the law delineates as "fruit of the poisonous tree."
THE STOP
Appellant contends that when Lieutenant Dorvola stopped the van and asked *8the occupants to step out, an arrest in fact cecurred even though the officer has no probable cause therefor. While in most cases probable cause is necessary for an arrest with or without a warrant, Henry v. United States, 361 U.S. 98, 80 S.Ct. 168, 4 L.Ed.2d 134 (1959); Wong Sun v. United States, 371 U.S. 471, 83 S.Ct. 407, 9 L.Ed.2d 441 (1963), something less than probable cause is required for an investigatory or "Terry"-type stop. Terry v. Ohio, 392 U.S. 1, 88 S.Ct. 1868, 20 L.Ed.2d 889 (1968); Parkhurst v. State, Wyo., 628 P.2d 1369 (1981); Rodarte v. City of Riverton, Wyo., 552 P.2d 1245 (1976) The United States Supreme Court has recently recognized the different attempts to define the notion of "less than those constituting probable cause" which justifies an investigatory stop. United States v. Cortez, - U.S. -, 101 S.Ct. 690, 697, 66 L.Ed.2d 621 (1981). The court concluded that no matter what the term, the totality of the circumstances is what must be considered. These circumstances must lead to a "particularized and objective basis for suspecting the particular person stopped of criminal activity." Cortez, supra, 101 S.Ct. at 695.
When appellant Cook was stopped, the following factors made up the circumstantial situation: (1) it was just after 1:00 a. m.; (2) an armed robbery had just taken place; (8) within one-half mile of the scene of the robbery, a police officer observed a vehicle coming from a somewhat private area-an area where the vehicle had no business being; and (4) in the vehicle, the officer observed a passenger, whose hair length at least matched the description of the robber. These four factors are the "specific and articulable facts" required for a "Terry"-type stop. The facts alone do not complete the picture. Reasonable inferences can be drawn from these facts. The inferences are those formed by an experienced police officer. Terry v. Ohio, supra.
"* * * (When used by trained law enforcement officers, objective facts, meaningless to the untrained, can be combined with permissible deductions from such facts to form a legitimate basis for suspicion of a particular person-and for action on that suspicion. * * **" Cortez, supra, 101 S.Ct. at 695.
The circumstances present in this case, along with reasonable inferences by an experienced police officer, furnished ample grounds for finding a reasonable and objective basis for an investigatory stop of the van.
Once stopped, the fact that the officers asked the occupants to step out of the vehicle does not necessarily imply that they were under arrest. Under Terry, police officers are authorized to conduct such a "pat-down" as is necessary for their own safety. Since the police had reason to believe the suspect was armed, it was not unreasonable to ask the occupants to remove themselves from the van so that a pat-down for weapons could be conducted and for the further purpose of providing a better opportunity for observation by the officers. Parkhurst, supra, 628 P.2d at 1376.
THE ARREST
Once the vehicle was stopped and the passengers observed and frisked, arguably probable cause for arrest then existed. The fact that the police officers contend appellant was not under arrest until he was identified back at the motel is of little significance. Rodarte, supra. When appellant was stopped and it was requested that he remove himself from the van, the police officers could then see that he matched the description of the robber given by Ms. Sexton. This factor coupled with appellant's presence near the scene of the robbery at an early hour of the morning was sufficient to " 'warrant a man of reasonable caution in the belief that' an offense has been * * * committed [by the person to be arrested]. Carroll v. United States, 267 U.S. 132, 162 [45 S.Ct. 280, 288, 69 L.Ed. 548]." Brinegar v. United States, 338 U.S. 160, 175-176, 69 S.Ct. 1302 [1311] 93 L.Ed. 1879 (1949).
Having arrested appellant, the police then possessed the authority to transport him back to the motel for purposes of further identification. Even though Miranda warnings were not given at that time, *9there is no Fifth Amendment problem. Miranda warnings are only required before custodial interrogation takes place for purposes of protecting a defendant's Fifth Amendment right against self-incrimination. Parkhurst, supra, concurring opinion, 628 P.2d 1385; Miranda v. Arizona, 384 U.S. 436, 86 S.Ct. 1602, 16 L.Ed.2d 694, 10 A.L.R.3d 974 (1966). There is no suggestion that the police officers attempted to interrogate appellant before he was identified and general on-the-scene questioning does not require Miranda warnings be given. Parkhurst, supra, concurring opinion, at 1887. The fact that appellant was taken to be identified does not amount to self-in-erimination. The Fifth Amendment privilege only protects against evidence of a "testimonial" or "communicative" nature. An identification does not fit into that category. Schmerber v. California, 384 U.S. 757, 86 S.Ct. 1826, 16 L.Ed.2d 908 (1966). In this sequence of events there was no illegality which resulted in the incriminating statement of appellant. There was no "poisonous tree."
To take it a step further, even if we assume that the arrest did not occur until after the identification, there was nothing that took place prior to that time which violated appellant's rights. The stop was reasonable as an investigatory measure, and there is every indication that appellant voluntarily returned to the motel. Even if the return to the motel could be termed a "seizure," it was valid pursuant to appellant's consent. In a Fourth Amendment seizure situation, defendant's knowledge of the right to refuse to consent does not have to be shown. The voluntariness is decided in light of all the surrounding circumstances. Schneckloth v. Bustamonte, 412 U.S. 218, 93 S.Ct. 2041, 36 L.Ed.2d 854 (1973). There is no indication from the record that appellant was in any way threatened or forced into consenting. There was no show of force and no apparent hesitation on the part of the appellant. Admittedly, the presence of police officers represented some display of authority, but the totality of the situation leaves little question that voluntariness of the consent was present.
Since none of the steps in the sequence of events leading up to appellant's incriminating statement were tainted with illegality, there was no reason to suppress the evidence. The lower court's refusal to suppress is correct, and will, therefore, be upheld.
SPEEDY TRIAL VIOLATION-RULE 22
Rule 22 of the Uniform Rules for the District Courts of the State of Wyoming was adopted September 14, 1979. The use of the rule has been somewhat limited, leaving much interpretation of the rule yet to be done. Among other things, the rule provides that speedy trial is the responsibility of the court and counsel,2 that criminal trials will take precedence over civil trials,3 and that criminal charges shall be brought to trial within 120 days following filing of an information4 unless the defendant is unable to obtain pretrial release, in which case the charge shall be brought to trial within 90 days following the information.5 The rule remains somewhat flexible in that it provides for possible continuances or delays.6 These continuances may be made on motion by defendant,7 by prosecuting attorney,8 or by the court on its own motion.9
*10There is no disputing the fact that, in this case, the 90-day time limit provided for in the rule was not complied with. Appellant was charged by information on February 7, 1980, and trial was not even set until May 19, 1980-12 days past the 90-day limit. The trial date was thereafter changed-to June 16, 1980-40 days past the 90-day limit.
Appellant contends that Rule 22 provides the exclusive and mandatory guidance for a speedy-trial action. It is further the defendant's contention that the burden of providing a speedy trial is on the State, the State has failed to meet that burden, and in light of the fact that the record reflects no motions for continuance or delay, a Rule 22 violation has occurred.
We cannot agree with appellant's conclusion. According to the United States Supreme Court in Barker v. Wingo, 407 U.S. 514, 92 S.Ct. 2182, 33 L.Ed.2d 101 (1972), a determination that a speedy-trial violation has occurred is the result of a balancing test. We put that balancing test to use in a recent Wyoming case, Estrada v. State, Wyo., 611 P.2d 850 (1980). The test requires a balancing of four factors: (1) length of delay; (2) reason for delay; (8) defendant's assertion of his right; and (4) prejudice to the defendant. Estrada, supra at 852.
Appellant recognizes the balancing test of Barker, supra, but concludes that where states set forth specific standards, some of the problems of the balancing test can be eliminated. However, this court refuses to accept that argument, and in a recent decision on a similar matter, has set forth the reasons why. Robinson v. State, Wyo., 627 P.2d 168 (1981). We held in Robinson that a strict reading of the time limitations in Rule 22 conflicts with the balancing test from Barker. Rule 22(c) and (d) set certain time limits to define a speedy trial violation. However, under the balancing test, the length of time between the information (charging) and the trial is only one of several factors to be considered. Estrada, supra at 852. The time limitation of the rule limits the flexibility and thus the preference for the balancing test. Nonetheless, the result in Robinson does not indicate an attempt to "do away" with Rule 22. In fact, we find the requisite flexibility by reading Rule 22(d)-time limit-with Rule 22(f}, which provides for continuances and delays.
Appellant argues that there was no motion for continuance or delay, which is the only means by which the 90-day time limit can be extended, thereby alleging a Rule 22 violation. However, in Robinson we also addressed this issue and concluded that when a case is set beyond the 90-day limit, it is done so on the court's own motion in administering its docket. Robinson, supra at 172. This provides adequate notice to defendant, with time to object and opportunity to raise issues of possible prejudice. By use of this reasoning, the initial date set for the Cook trial, whether May 19, 1980, or June 16, 1980, did not entail an unnecessary delay. The delay, whether 12 days or 40 days, was by the court on its own motion required in the "due administration of justice."10
Appellant's burden-of-proof argument is also misguided. The argument begins with pre-Rule 22 decisions placing the burden on the State. Barker v. Wingo, supra; Estrada v. State, supra. We find no difficulty in this initial approach; however, appellant goes on to read that same burden into Rule 22. Rule 22(a) provides:
"It shall be the responsibility of court and counsel to insure to each person charged with a crime of speedy trial in accordance with the provisions of this rule."
There exists no indication here that the State bears the entire burden. In fact, it would appear that defense counsel has an affirmative duty to make certain a speedy-trial violation does not occur. Once the State or the court sets a trial date beyond the 90-day limit, as long as there is a valid reason for doing so, their burden has been met. At that point defense counsel has the *11burden (an affirmative duty) of making certain that the delay does not prejudice defendant in any way.
Furthermore, failure by defense counsel to fulfill that duty within a reasonable time operates as a waiver of any objections. Silence or inaction on the part of defendant acts as implied abandonment of the right to speedy trial. Cherniwchan v. State, Wyo., 594 P.2d 464 (1979).
Appellant's final argument with regard to interpretation of Rule 22 raises the question of prejudice to defendant. Rule 22 provides that when a motion is made to continue or delay a case, no prejudice to the defendant may result. The defendant must show "specifically in writing" how the delay will cause prejudice.11
Here appellant changes direction and moves toward use of Estrada rather than Rule 22. Appellant makes use of Estrada to say that no prejudice need be shown in a Rule 22 violation. However, this ruling with regard to prejudice must be read with the balancing rule. Within the context of the balancing test, prejudice is only a factor to be considered, and must be considered with all other elements and circumstances of the balancing. Cherniwehan, supra at 468. It is in this light that prejudice need not be shown. When a balancing of factors occurs, prejudice need not be present to find a speedy-trial violation. Appellant attempts to use the prejudice argument standing alone. The attempt cannot sue-ceed. Rule 22 expressly provides that defendant must show specific prejudice by a continuance or delay. Alleging a Rule 22 violation, appellant must comply with this requirement.
Summarizing the elements of this issue, it appears that (1) upon setting of the trial date, the court made a valid motion on its own behalf for a continuance under Rule 22(f); (2) the motion provided ample notice to appellant; (8) appellant failed to raise the speedy trial issue until after the 90 days were up, thus waiving his right; and (4) when appellant did raise the speedy-trial issue, he failed to allege specific prejudice required by Rule 22. In light of these circumstances, we are forced to conclude that no speedy-trial violation has occurred. The lower court holding of this same conclusion must be affirmed.
CONCLUSION
For the reasons given, we find that appellant's challenge to the lower court decision cannot succeed. We find no illegality present in the stop, arrest or identification leading up to the incriminating statement. Consequently, no reason exists to suppress the evidence. Our interpretation of Rule 22 leads us to the conclusion that no speedy-trial issue can be raised in this case. The lower court holding with regard to these issues is affirmed.
. Section 6-4-402, W.S.1977, provides:
"Whoever forcibly and feloniously takes from the person or possession of another any property of value, by violence or by putting in fear, when a firearm or other deadly weapon is used or exhibited in the commission of the offense, is guilty of aggravated robbery and shall be imprisoned in the penitentiary for not less than five (5) years nor more than fifty (50) years."
. Rule 22(a), Uniform Rules for the District Courts of the State of Wyoming.
. Rule 22(b), Uniform Rules for the District Courts of the State of Wyoming.
. Rule 22(c), Uniform Rules for the District Courts of the State of Wyoming.
. Rule 22(d), Uniform Rules for the District Courts of the State of Wyoming.
. Rule 22(f), Uniform Rules for the District Courts of the State of Wyoming.
. Rule 22(f)(1), Uniform Rules for the District Courts of the State of Wyoming.
. Rule 22(f)(2), Uniform Rules for the District Courts of the State of Wyoming.
. Rule 22(f)(3), Uniform Rules for the District Courts of the State of Wyoming.
. Rule 22(f)(3), Uniform Rules for District Courts of the State of Wyoming.
. Rule 22(f)(2)(iii) and (f)(3), Uniform Rules for the District Courts of the State of Wyoming.