9:30am | Reflecting on recent trips to three great capital  cities—Washington D.C., London, and Paris—I was struck by their  strikingly divergent histories of urban planning. Central London still  reflects its medieval past, with a chaotic web of streets only partially  loosened by an amorphic grid. Paris’s own historic core was transformed  during the reign of Napoleon; in a quintessential example of top-down  master planning, grand boulevards and avenues slashed through the  existing city fabric, intersecting at monuments to French pride. The  designers of Washington took a page from the Parisian model of  hub-and-spoke boulevards and monuments, but combined it with a practical  orthogonal grid.
 
Yet despite these differences, there is  something important shared by the vibrant open spaces of these three  “world cities.” This common thread is one of unexpected yet creative  juxtaposition: in each city, different organizing principles from  different historical periods collide to create special moments sprinkled  throughout urban environment. Strange traffic patterns can emerge when  streets intersect at oblique angles, but sometimes the leftover spaces  from these odd intersections can become great urban places. For  instance, between DuPont Circle and Sheridan Square in Washington,  Massachusetts Avenue and Q Street intersect in a manner that leaves a  pair of small triangular spaces left over. The Massachusetts Avenue and Q  Street arterials are well-designed for pedestrians, as are DuPont  Circle and Sheridan Square, but the two incidental spaces are no less  special. Similar situations appear frequently in Paris as well: in one  case, Boulevard Saint-Germaine and the smaller Rue Gozlin graze each  other at an oblique angle, leaving a remnant space called Place Jacques  Copeau. Rather than fill these leftover spaces with additional turn  lanes or parking lots, city planners left them as open spaces. As a  result, they now brim over with pedestrian-friendly features–from  outdoor dining and transit stops to bike parking–creating pockets of  vibrancy in the city.
 
Of course, these sorts of accidental  spaces created by overlapping city block structures are not exclusive to  seats of national government. New York’s Times Square, formed by  Broadway intersecting obliquely with Seventh Avenue, has become an  iconic urban space drawing pedestrians from across the globe. Indeed,  portions of the road have now been removed entirely to increase the  possibilities for street life. Under the Spanish, Los Angeles was  originally laid out with streets in a grid running from southwest to  northeast. As the city expanded, new streets were laid out on a  “Jeffersonian grid” matching the points of the compass, from north to  south and east to west. In areas around downtown Los Angeles, the coming  together of these two grids provides numerous opportunities for  creating new urban plazas (for instance, along Hoover Street). Such  opportunities are lost when improving traffic flow is prioritized over  pedestrians.
 
These kinds of possibilities created by streets  intersecting at unusual angles are not limited to the cities discussed  above. From Bixby Knolls to Belmont Shore and downtown, there are  multiple opportunities in Long Beach for creating parks, plazas, and  squares that take advantage of the legacies of different eras of  development. For instance, Livingston Street divides Belmont Shore’s  compact block structure with the more typically-scaled streets of  Belmont Heights. As currently configured, Livingston is oriented toward  facilitating automobile traffic between Ocean Boulevard and Second  Street. At present, it thus acts as a dividing line between the  communities of Belmont Shore and Belmont Heights, rather than working to  bind them together. With a natural grade change of over a dozen feet  from one sidewalk to the other, as well as a 150-foot wide right-of-way,  there is no shortage of opportunity to transform this half-mile long  arterial into a wonderful greenbelt.
 
Alamitos Avenue extends  from the waterfront to the Long Beach City College campus on Pacific  Coast Highway. This is one of the most historic streets in Long Beach,  delineating the original border between Rancho Los Cerritos and Rancho  Los Alamitos, which were combined to make the original city boundary.  This diagonal street slices through a half-dozen neighborhoods that  house some of the most unique features in Long Beach’s urban fabric,  from the historic district of Brenner Place to the pedestrian-only  Toledo Walk. Recently, the city has begun to creatively leverage some of  the opportunities created by Alamitos Avenue, notably at its  intersections with Pacific Coast Highway where an expansive garden was  created at the entrance of Barcelona Place and a new park created at  15th Street. Yet still many more intersections along Alamitos Avenue  remain to be transformed to improve surrounding neighborhoods and  reinforce the importance of this historic street.
While San  Antonio Drive is a unique diagonal feature in the fabric of the Bixby  Knolls area, the surrounding grid largely does not take advantage of the  opportunities it provides. However, there do remain occasions where  streets meeting at less-than-right angles with San Antonio Drive allow  special places to emerge. The native California landscaping of Orange  Park at the southwest corner of San Antonio’s intersection with Orange  Avenue, is one such example. Other opportunities exist near the  commercial districts at Atlantic Avenue and Long Beach Boulevard.  Unfortunately, many of these remaining spaces are occupied by small,  inefficient parking lots or unneeded additional lanes for vehicles.
 
Such  problems of uninspired or inefficient use of these kinds of “angled”  open spaces are not unique to Bixby Knolls; in many cases, they can  easily be corrected with different surface treatments (grass versus  asphalt). New York and San Francisco have provided successful examples  of converting the “black-top” of parking lots and streets to temporary  pedestrian plazas by just painting the asphalt area and introducing  benches and tables. With good design—including landscaping, street  furniture, and provisions for pedestrian-oriented activity—these small  left-over spaces where street networks collide can enrich the local  environment, be that environment residential or commercial in nature. It  is just a matter of finding those special moments and turning them over  to people.
Photo: Traffic  square in Paris—carousel, Metro, bike racks, newstand and dining.
