The defendant appeals from convictions on three of the seven charges contained in four complaints. All of the alleged offenses stemmed from and were directly related to the defendant’s involvement in a traffic accident. *562 In the aftermath of that accident the defendant was arrested for operating a motor vehicle under the influence of intoxicating liquor and that arrest, in turn, led to the discovery of two unauthorized firearms, one of which had been stolen.
None of the questions raised on appeal has merit and only a brief discussion of each is warranted. We thus treat the claims seriatim, pausing only long enough to elaborate on the defendant’s claim that, as matter of right, he may demand that some of the offenses with which he has been charged be tried without a jury, and the balance be tried to a jury. 1 As the defendant was found not guilty of receiving stolen property (complaint no. 81-10827, count one), we have no occasion to discuss that charge. Nor is it necessary for us to discuss the specifics of the charges of possession of burglarious instruments and possession of a Class B controlled substance, each of which was dismissed on the Commonwealth’s motion, without objection, prior to trial.
1. The defendant had waived his right to a first instance jury trial and was ready to proceed at his bench trial when the Commonwealth moved to amend two of the charges. The defendant objected. The judge denied the motion and dismissed the two charges without prejudice. When the Commonwealth brought new complaints for the same offenses, the defendant demanded his first instance jury trial as to the two new complaints, but the judge determined that the defendant could either proceed entirely in the jury-waived session (on all charges) or claim a jury trial on all charges. The defendant objected and elected a first instance jury trial only on the two new complaints. The judge thereafter transferred all complaints to the jury session. The defendant later requested that all charges be re-transferred to the jury-waived session. After hearing, the judge denied the defendant’s request. The defendant claims on appeal that in these circumstances he either had a *563 right to split the complaints into jury and nonjury trials, or alternatively, that he had a right to a bench trial on all charges.
The defendant neither understands his rights, nor perceives his circumstances realistically. A defendant is not entitled to two trials as á matter of right, but only to “an impartial trial by jury”
(Singer
v.
United States,
What is presented here is simply a question of severance. The decision whether to sever indictments properly joined for purposes of trial rests in the sound discretion of the trial judge.
Commonwealth
v.
Cruz,
Passing over the defendant’s failure to move for or otherwise request any relief from prejudicial joinder pursuant to Mass.R.Crim.P. 9(d)(2),
2. The defendant asserts that, prior to consenting to the breathalyzer test, he was not informed that by statute he could arrange “to have another such test or analysis made by a person or physician selected by him.” G. L. c. 90, § 24(1)(e), as amended through St. 1980, c. 383, § 1. Not only is there no factual support for this claim in the record, the only evidence on this point persuasively indicates a contrary series of events. Contrast
Commonwealth
v. An-
*564
drade,
3. The denial of the defendant’s motion for a required finding of not guilty was correct in all respects. Based on what we have already said, the properly admitted result of the breathalyzer test provided sufficient evidence to meet the requisite standard of proof for the drunk driving offense. See, e.g.,
Commonwealth
v.
Latimore,
4. The defendant asserts that he was somehow prejudiced by certain actions of the judge. At the outset the judge appointed a forelady of the jury, but he later refused, over objection, to include her name in the draw to determine the alternate jurors. The defendant’s claim in this regard is totally without substance. The issue has long been settled by the Supreme Judicial Court. See
Commonwealth
v.
Bellino,
Judgments affirmed.
Notes
No argument has been made that there is a constitutional right to a nonjury trial. See in this regard,
Singer
v.
United States,
