I want to plot my trajectories using geom_path, by having the changes of speed (in each trajectory) in colorRampPalette. I have seen such a plot, but I do not know how to make it.

Here is my current code, showing different road users in colours, which I would like to have it by speed:

  geom_path(aes(x = x_axis , y = y_axis , group = User_id, color = User_type))+ 
  scale_colour_manual(values = c("#0066CC", "#404040", "#FF0000", "#00CC00"))+
  labs(x = "X-Coordinates (m)", y = "Y-Coordinates (m)") +

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