Full-Length Shooter Lanes
Most pinball games have a shooter lane(on the right) that is the entire length of the playfield.
Partial Length Shooter Lanes
Some shooter lanes go only partway back to the rear of the playfield, and diverts left(with a 1-way gate). This allows for more playfield space.
Examples: Vector, No Good Gofers
No Shooter Lanes
Lexy Lightspeed has no shooter lane at all, due to the video display hardware. Bally Spectrum is an old solid state where the ball pops out from under the apron. Starship Troopers has the outlane and shooter lane shared.