Controlled intersections use some from of which of the following

These are the answers to your Question. 

Flashing signal lights 
Circular arrows 
Signal lights 
All of the above

Covey tried to surprise and ambush his slaves, hiding and waiting for them so they never knew when to expect him. His whole life was devoted to duplicity, devoted to "planning and perpetrating the grossest deceptions." He also conceived of himself as religious, but of course this was very hypocritical.