The geometry at roads intersections has remained the same for centuries. Conventional solutions, landscaping and beautification won’t address: pedestrian, bicycle, safety, delays, capacity, traffic congestion and emissions, all of them, critical issues and demands. Two phase at-grade geometrics plus state of the art computerized hardware and software traffic control brings the common intersection, the basic street network cell to the 21st Century.

The 21st Century Street “two phases per cycle intersection or 2pi” safely, efficiently and economically increases capacity, reduces emissions and delays; accommodating land use access and mobility modes: pedestrians, bicyclists, transit, trucks and cars on the same "complete street."

This systemic design, allows for network implementation at congested intersections. Its high vehicular capacity snatches back the total capacity of the city’s streets while simultaneously providing less polluted, livable and sustainable human scale urban mobility “21st Century super corridors.”

The 2pi design geometrically and in advance, aligns and queues all left turn travel lanes on the “left side of the street” as a result of this, all pedestrian, bicycle and vehicular movements traverse the intersection in only two phases per cycle. Hence its unique characteristic: The next green light is always your green light for pedestrians and vehicles alike.

The 2pi geometry creates and prioritizes a “safe crossing path” for pedestrians (ADA standards, including the entire range of pedestrian disabilities) to negotiate the intersection protected from right and left turning vehicles allocating 50% on average of green cycle time per phase.

Pedestrians walk parallel to through and left moving vehicular traffic, while the left turn crossing movements are transpiring “outside” the node of the intersection eliminating conflicting paths with pedestrians adding safety, confidence and reliability.

Pedestrians are paramount in this design, it provides safety islands, reduces crossing time, and exposure to traffic makes safer and enjoyable pedestrian travel. The parallel merging of the pedestrian and the vehicles into two phase movements at the intersection allows for pedestrian crossings to be constantly active either on set time, or activated by push button.
2pi™’s Single Point Pedestrian Crossings eliminates the difficulty figuring out depart and destination corners. At the corners there is only one point of departure and destination.

1. - Pedestrians are, at all times, within driver’s angle of vision, sudden conflict due to pedestrians walking behind stopped vehicles is completely avoided.
2. - Pedestrian’s safety is greatly increased since conflicting through traffic, left and right turners have been eliminated from pedestrians paths and crossing phases. Pedestrians always walk parallel to moving vehicles.

Bicyclist’s lanes location is within the curb-to-curb sections. Basically enjoying the same advantages, prerogatives and safety pedestrians do.

Since the optimization and increase safety of one movement or transportation mode at the intersection does not requires the penalization of other, the benefits in reduced delays, emissions and traffic congestion are real and comprehensive. The intersection remains completely functional as a transit hub and truck route.

Design Benefits: Pedestrian oriented, safer, at-grade, environment friendly, and prompt, economical and comprehensive urban mobility solution.