Absolutely. I have seen so many people get into dangerous situations by not being assertive, or by making up their minds too late. Or even put others into dangerous situations. Just the other week I was coming down a hill, and the cyclist in front of me decided for no particular reason to suddenly slow down, waive her right of way and let a car turn in from a driveway into the road in front of her. The driver was looking only at her, and not at me approaching right behind her, which meant that suddenly I too had to come to almost a full stop.