Thе plaintiff Yvonne Lowell was the owner and operator of a motor vehicle in which the minor plaintiffs, Denise Lowell and Yvonne Rose Lowell, who bring this action by their father and next friend, Gilbert Lowell, werе passengers. Gilbert also sues, as an individual plaintiff, to recover expenditures made by him as the husband of Yvonne and father of Denise and Yvonne Rose. The plaintiffs’ car was struck in the rear by a car owned by the defendant Francis E. Daly and operated as a family car by the defendant Thomas E. Daly. Both cars were traveling southerly along Garden Street in Hartford, and the collision took place while the plaintiffs’ car was stopped at a stop sign at the intersection with Charlotte Street.
The plaintiffs complain of the court’s refusal to
*268
permit one of some eighteen questions to be asked on the voir dire. Most of the other questiоns were allowed, including a question as to whether any venireman, or any member of his family, held office or owned stock in any insurance company. See
Girard
v.
Grosvenordale Co.,
The plaintiffs claim error in the court’s charge ns to the so-called “following too closely” statute, General Statutes § 14-240. They had filed a request to charge which in effect merely quoted the statute and stated that its violation would constitute negligence per se and that such negligence, if it was a proximate cause of the collision, would render the defendants liable. The charge requested was in substance given.
The court in effect charged that if the plaintiffs’ car was stopped at the stop sign when the defendant оperator first saw it, or in the exercise of reasonable care should have seen it, then the statute did not apply. At the close of the charge, the plaintiffs excepted to this restriction on the applicability of the statute. Under the second paragraph of §153 of the Practice Book, “[a]ny party intending to claim the benefit of . . . any .specific statute shall file a written request to charge on the legal principle involved.” The phrase “on the legal principle involved” requires more than .a mere reference to, or quotation of, the statute
*270
coupled with a statement that its violation by a defendant in a situation governed by it would constitute negligence per se. What is required is a request to charge “on the legal principle involved.” This calls for a request explaining the meaning and interpretation of the statute in the light of the claims of proof in the case. See
Ziskin
v.
Confietto,
The instant case did not involve a situation where the trial court unexpectedly charged on an inapplicable statute, аs in cases such as
Angelino
v.
Hersey,
Quite apart from the technical requirements of § 153 or any other rule, it is sound practice to submit requests to charge, with supporting citations, covering unusual or difficult legal points as early in a trial as is reasonably possible, so as to accord the court a fаir opportunity for study and consideration of the questions involved. Although attorneys have the opportunity to prepare a case over a considerable period of time in advance of trial, the court does not ordinarily have a chance even to see the pleadings until the commencement of the trial. A principal purpose of § 153, as of many other proсedural rules, is to obviate error and thereby avoid the necessity for retrials, with the attendant expense to litigants and the public. See cases such as
Towhill
v.
Kane,
Another assignment of error relates to the ex-
*272
elusion of a question asked of a physicist whom the plaintiffs qualified as an expert witness in his field. The defendant operator, who the plaintiffs themselves claim was the only eyewitness to the collision, testified that, seeing the plaintiffs’ vehicle, оver 300 feet ahead, stopped at the stop sign, he slowed his car to various speeds as he approached the plaintiffs’ car. He did not give the specific distances he traveled at any of these speeds, nor mention any points from which the distances could be computed. The plaintiffs asked the expert whether, if a car traveling at twenty-five miles per hour travels a distаnce of 350 feet, he could tell the time it would take to travel that distance. The witness answered in the affirmative. He was then asked what that time would be. The defendants objected on the ground that there was no evidence that any particular distance had been traveled at the speed of twenty-five miles an hour. The objection was properly sustained. In the absence of any evidence that the defendant operator traveled 350 feet, or about that distance, at or about twenty-five miles an hour, it does not appear that there was any ground for admitting the question or that an answer to it, had it been permitted, would have done other than confuse the jury.
Floyd
v.
Fruit Industries, Inc.,
The plaintiffs assign error in the refusal of the court to set aside the verdict as against the evidence. There was evidence that the highways traversed by the defendant operator up to the scene of the collision had been clear except for patches of snow and that he was operating his сar with reasonable care, but that there was glare ice in the immediate vicinity of the collision and that his car
*273
skidded on this ice. Especially in view of the evidence as to skidding, the jury might have failed to find that the plaintiffs had proved actionable negligence, sinee evidence of skidding is not, in and of itself, evidence of negligence. See cases such as
Nichols
v.
Nichols,
The remaining assignments of error do not require discussion.
There is no error.
In this opinion the other judges concurred.
