Customized version of http://www.thingiverse.com/thing:615256

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=615256

Using the following options:

stud_rescale = 1
block_type = tile
slope_end_height = 0
roadway_width = 0
block_brand = lego
block_height_ratio = .33333333333
wing_base_length = 3
stud_type = solid
technic_holes = no
block_length = 1
wing_type = full
wing_end_width = 2
block_width = 8
wing_stud_notches = yes
use_reinforcement = no
curve_type = concave
vertical_axle_holes = no
roadway_y = 0
roadway_x = 0
roadway_length = 0
dual_sided = no
slope_stud_rows = 1
curve_stud_rows = 5
curve_end_height = 0