Freeway way on ramp...... entering at a good pace..... to match the speed of traffic...... turn signal on....
In cars, I 'lean into' the driver's mirror..... keeping my 'view' ahead, but with a glance behind me, with a little larger view. ( Is there a moron coming up at 95 mph, or someone changing lanes ).
This procedure is what we trained the Highway Patrol.
Around town..... Making a right - lane change...... I ALWAYS LOOK QUICKLY TO MY RIGHT, behind my right,sometimes twice.
Those moronic drivers that make a sudden pass / speed up, into a "hole"..... For an or-gaz-mic advance of 35 feet.