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There is no evidence that bartering was a precursor to currency, in fact the opposite is more likely the case. Bartering is used by people who already have an understanding of currency when they don't have money to use.

I live in america and kids play in the streets all the time and cars are a serious danger. Most of our urban streets are smaller than this and the cars are going much faster. 14kph is less than 9mph, and the lowest speed limits in my area go is 25mph. When these trams are going slow enough to run along side, the danger of hitting someone that you didn't see in time is FAR lower. Even if someone did manage to get hit by a tram at this speed (or slower because they would likely already be hitting the breaks) they are much less likely to be injured. I'm not necessarily disagreeing with you that they could both be dangerous but you are talking about the danger of trams vs cars as if they are equal. Most of the necessary safety measures are already in place (ie, the 14kph speed) and I am far less worried about kids running around in a world of trams than a world of cars.