Why ask this question under CAD Automation?
SHELL ECO MARATHON 2018 OFFICIAL RULES.
PROTOTYPE GROUP
ARTICLE 39:
DIMENSIONS
a) The vehicle maximum height must be less than 1000 mm.
b) The vehicle track width must be at least 500 mm , measured between the midpoints where the tyres of the outermost wheels touch the ground.
c) The ratio of height divided by track width must be less than 1.25.
d) The vehicle wheelbase must be at least1000 mm.
e) The maximum total vehicle width must not exceed1300 mm.
f) The maximum total length must not exceed 3500 mm.
g) The maximum vehicle weight, without the Driver is 140 kg.
h) None of the body dimensions above must be achieved by design singularities such as ‘stuck-on’ appendages or cut-outs.