OMAHA, Nebraska. As biking in cities becomes more popular, more and more people are choosing to bike with their children in tow. Bicyclists are vulnerable road users. If a biker is hit by a car, the biker is more likely to sustain injuries. When drivers make mistakes, the people most likely to be hurt are the ones riding in bikes. So, when people see bikers riding with their children in car seats or in trailers behind their bikes, the first reaction might be that these riders are endangering their children. But are they?