. >> reporter: jeannette is nor careful about when and where she uses her phone. next week the glow will shine an hour earlier. >> i will carry my flashlight. >> reporter: when daylight savings last year robberies went up. >> we realized that people's commutes were during hours of darkness we wanted to advise the public. >> reporter: with a dark rush hour days away, police will hand out fliers in commuter corridors tomorrow morning hoping to shine a light on the dangers in the dark. >> when is it dark, is it harder for people to keep track of everything. it's harder to see. you're less likely to be aware. >> sfpd will be more visible, hoping to discourage thieves who want to take advantage of the earlier opportunities. >> police tell me one strategy they have is to conduct more traffic stops near the transit hubs. but they are not just looking for criminals but for people who are violating traffic laws. jean ellie, nbc bay area news. >>> now to the weather. bundle up. things are about to get chilly in the bay area. a frost advisory will take affect this week in th