Plaintiffs appeal from summary judgment (Code Civ. Proc., § 437c) in favor of defendant city. The action seeks damages for personal injuries allegedly suffered in the collision of an automobile driven by plaintiff Nicolas Dudum with a truck driven by defendant Goin and owned by him and other defendants. Plaintiff Nicolas, with the other plaintiffs as passengers, drove east on Second Avenue in San Mateo. The truck was traveling south on Delaware Street, and the vehicles collided in the intersection of these two streets. Plaintiffs’ claim against defendant city is based upon the assertion that the stop sign at the southwest corner of the intersection—the sign which would require plaintiffs’ car to stop—was obscured by a tree, thus constituting a dangerous or defective condition of public property (Gov. Code, § 53051), which, with the concurring negligence of defendant Goin, proximately caused the collision and the resulting injury to the three plaintiffs.
Validity of the summary judgment is to be determined by the sufficiency of the affidavits considered upon the motion
(McComsey
v.
Leaf,
Defendant city filed the affidavit of its city engineer averring that at or before the accident there was no tree growing in or forming any part of any public property at the southwest corner of this intersection, and that the only trees growing in the vicinity of the corner are situated on private property. Plaintiffs’ counteraffidavit alleges that the stop sign “was obscured by the branches and foliage of a tree that was rooted not far from the stop sign.” Looking to the omissions as well as the allegations of the two affidavits, *596 we must conclude that the sign was in fact obscured by-branches and foliage of a tree, but that the obscuring tree was located upon private property. Whether the branches of this privately-owned tree overhung public property cannot be determined.
Stop signs are “public property” within the meaning of Government Code, section 53051.
(Irvin
v.
Padelford,
But the rule is clear that a city’s liability under Government Code, section 53051, may be based upon factors other than structural or mechanical defects. “There can be no doubt that a dangerous or defective condition can be created by the use or general plan of operation of government operated property, as well as by a structural defect.”
(Bauman
v.
City & County of San Francisco,
The rule is clear that a municipality is not liable for failure to install a boulevard stop sign
(Perry
v.
City of Santa Monica,
Respondent, however, stands upon the fact that the tree which obscured plaintiff’s view of the sign grew upon private property. Even if it be conceded that concealment of the sign by public property would create a dangerous condition within the meaning of
Bauman
v.
City & County of San Francisco, supra,
*598
We are limited to the facts shown by the affidavits
(Kimber
v.
Jones, supra,
Respondent’s brief suggests that there is no showing of proximate cause since plaintiff driver was not on the arterial street where, as in
Irvin
v.
Padelford, supra,
In consideration of this ease, we have been limited to an inquiry whether the ultimate facts which might be found from the allegations of the affidavits show the existence of any triable issue. The evidence adduced at trial may support none of the possible fact conclusions suggested in this opinion, or may warrant findings not suggested here. Our decision in no way limits the trier of the facts, but merely determines that the ease cannot be disposed of on motion for summary judgment.
Judgment reversed.
Kaufman, P. J., and Dooling, J., concurred.
