Pfleger — and perhaps hundreds of others — plan to shut down traffic on the expressway to send a message: Elected leaders must fix neighborhood schools and create better job prospects to supplant the violence plaguing some pockets of the city. In 2016, gun violence reached levels that had not been seen in 20 years, according to data kept by the Tribune. And while the number of shootings victims has decreased since then, it’s still higher than 2015 and 2014.