Fined during administrative proceedings for allegedly violating a Joliet ordinance that restricts the weight of vehicles on designated roads, five truck drivers challenged the in-house adjudications as exceeding the city’s home rule authority.Section 1-2.1-2 of the Illinois Municipal Code authorizes “administrative adjudication of municipal code violations to the extent permitted by the Illinois Constitution,” but there are one or two exceptions — the precise number being a crucial question &mdash …