public ObservableCollection<StreetViewModel> Streets { get; set; }
        
        public StreetsViewModel()
        {          
            Streets = new ObservableCollection<StreetViewModel>();
          
            Streets.Add(new StreetViewModel(new Street
            {
                Name = "Moskovski prospect",
                CarsVolume = 20,
                PathStr = "линия кароче"
            }));
         }

<?xml version="1.0" encoding="utf-8" ?>
<Streets>
   <Street>
      <Name>Moskovski prospect</Name>
      <CarsCount>100></CarsCount>
   </Street>
</Streets>

using System;
using System.Collections.Generic;
using System.IO;
using System.Xml;
using System.Xml.Linq;

public class Street
{
	public string Name {get; set;}
	public long CarsCount {get; set;}
}

public class XmlStreetReader : IDisposable
{
	Stream sourceStream;
	
	public XmlStreetReader(string fileName)
	{
		sourceStream = new FileStream(fileName, FileMode.Open);
	}
	
	public void Dispose()
	{
		sourceStream.Dispose();
	}
	
	public IEnumerable<Street> Streets
	{
		get { return StreetsEnumerable(); }
	}
	
	private IEnumerable<Street> StreetsEnumerable()
	{
		using (var reader = XmlReader.Create(sourceStream)) {

			while (reader.Read()) {
				if (reader.NodeType == XmlNodeType.Element && reader.Name == "Street") {
					
					var street = new Street();
					var streetNode = (XElement)XElement.ReadFrom(reader);
					
					foreach (var desc in streetNode.Descendants()) {
						if (desc.NodeType == XmlNodeType.Element) {
							switch (desc.Name.ToString()) {
								case "Name":      street.Name      = desc.Value; break;
								case "CarsCount": street.CarsCount = long.Parse(desc.Value); break;
							}
						}
					}
					
					yield return street;
				}
			}
		}
	}
}

class Application
{
	public static void Main()
	{
		using (var reader = new XmlStreetReader("streets.xml")) {
			foreach (var street in reader.Streets) {
				Console.WriteLine("{0}: {1}", street.Name, street.CarsCount);
			}
		}
	}
}