Tourists and newcomers must attend a "mandatory training" and pass a test first, the fake letter said.
A vehicle hit them at 162nd Street in Murray Hill Tuesday afternoon.
Brooklyn Community Board 8 asked the Department of Transportation to beef up their plan.
The ramp's completion date was pushed back 10 months to July 2015, officials said.
The DOT plans to add new lighting and install signage to ward off rogue cyclists in the passageway.
The intersection of Riverside Drive and 157th Street has seen five accidents since July 2012.
More than 200 pedestrians ages 60 and older were killed in Brooklyn over 10 years, a study found.
Irving Schachter, 75, was training for a marathon when he was hit by a biker, police said.
Police aren't going after teen riders, saying they'd have to be arrested rather than written summonses.
An NYPD deputy said officials "will make mistakes" along the way, but will continue to use social media.
The DOT's plan would force drivers who want to go east on Myrtle Avenue to go west and make a u-turn.
A 74-year-old woman was seriously hurt by a CitySights NY bus at Seventh Avenue and West 14th Street.
Helen Rosenthal wants to extend "Cooper's Law" to cover all New York drivers.
The DOT laid out plans to make two UWS intersections safer for pedestrians and cyclists.
Gedalya Grinzaid was crossing Carroll Street in Crown Heights when he was hit, police said.
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