A street is a basic paved traffic link within an urban area; An avenue was originally grander, wider and often lined with trees or other flora. But the distinction has changed a bit with property developers call new roads “avenues” to make a more grandiose impression. A boulevard is usually a widened, multi-lane arterial street with landscaping between the kerbs and pavements on either side. But like Avenue, there is a bit of exaggeration. Broadly, a street will always be a street and a Avenue or Boulevard may still be just very slightly bigger streets!