After some North Seattle neighbors blocked streets with barricades to prevent gunfire, city officials are working on legislation that could help other neighborhoods do the same. Residents blocked three side streets just west of Aurora Avenue North on Saturday with soil-filled steel planters in response to shootings in the area this month, including one that blasted a hole through the wall of an infant’s bedroom.  Mayor Katie Wilson directed the city’s Transportation Department on Wednesday to replace the planters with “temporary traffic calming measures” while her office looks into permanent solutions. Meanwhile, two City Council members are working on a bill that would allow transportation officials to close streets, if the police chief recommends doing so to prevent gun violence and other crime.  The leaders took action within days of the makeshift barricades appearing on North 97th, 98th and 102nd streets.…