This article is about transportation systems in and around Dallas, Texas (USA). Walking and bicycling Dallas is the 30th most walkable large city in the US, with a Walk Score of 47. Most of the pedestrian-friendly areas in the city are near downtown and Uptown. The majority of Dallas, whether or not it was developed with the pedestrian in mind, was completely rebuilt or reworked to accommodate the vehicle in the mid-20th century. In the late 1990s and early 2000s (decade), the importance of the pedestrian, bicyclist, and those who use mass transportation began to be realized and most new developments cater to all forms of transportation. Walking trails, though once nonexistent, are also starting to be built and improved by the city. Perhaps the flagship is the Katy Trail, built over the old Katy Railway, which goes from the Victory Park neighborhood through Uptown and Oak Lawn up to Knox Park. Other trails include the levee-top trails along the Trinity River and the Texas Buckeye Trail in the Great Trinity Forest of south Dallas. The city also maintains walking trails at area parks including parks around White Rock Lake and Bachman Lake. The city maintains 800 lane miles of cyclist-selected bike routes along low-volume roadways throughout the city that parallel major thoroughfares. The City does not employ bicycle control devices like bike lanes, as the necessary pre-conditions do not exist. The city has also installed a series of Pedestrian Tunnels in Downtown Dallas, although these have been under much criticism regarding their ability to "suck the life off of" the aboveground streets. Streets Dallas is devoid of any major street grid as a whole, though a number of major attempts intersect at awkward angles and in confusing interchanges around the city. The main street grid in the center city runs 45° to the typical N/S/E/W grid, creating confusion for many out-of-town visitors. This street grid prevails primarily in east Dallas, though it also permeates Oak Lawn, portions of downtown, and the Cedars. Another much smaller street grid lies downtown between Pacific and Young streets — it is about 15° off the typical N/S/E/W grid, and is on average 5-8 streets across N/S and about wide E/W. There is also a fairly extensive N/S/E/W grid around the original city of Oak Cliff. The rest of Dallas, developed from the middle of the 20th century on, is typically on a N/S/E/W