UCI CYCLING REGULATIONS  (text modified on 26.06.07; 01.02.08; 01.02.09; 01.01.10; 01.02.11; 01.10.13; 01.02.14,  01.02.19)  Circuits which are shorter than 7 km, longer than 15 km, or exceed the above-mentioned  percentage of gradient, but with unique and desirable features, may be permitted at the  discretion of the UCI.  Tricycles, handcycles and youth category riders may use a shorter and less technically  difficult circuit, at the discretion of UCI.  The organisers shall submit to the UCI for approval a circuit which fulfil the requirements  defined in the Organisation Guide.  (text modified on 26.06.07; 01.01.10; 01.01.16)  Riders will be called to the line in the predefined lanes, by sport class, age category or  group in the following order:  Riders who need assistance at the start should place themselves near the fences to  facilitate a safe start for everyone.  (text modified on 01.1.09; 01.02.11; 01.10.11, 01.01.16)  In all races except the races with combined starts, any athlete taking pace or drafting  from an athlete in another division, group or sport class, will be disqualified. The racing  procedure will be in compliance with articles 2.4.017 to 2.4.020.  (text modified on 01.02.09; 01.07.10)  16.7.005  In a road race where different sport classes are starting together (combined start), pacing  and drafting between those sport classes is allowed.  2.  According to the order of the most recently published general UCI Ranking.  1.  Road Race World Champion or outgoing Road Race World Champion  respectively;  16.7.004  The UCI may decide to have several sport classes and/or age categories start together  as one group. Each sport class, age category or group thus constituted must start with a  minimum time gap of two minutes to avoid the mixing of groups.  16.7.003  Road race circuits at all UCI para-cycling events, shall be between 7 km and 15 km.  Climbs on any circuit must have a maximum of 8 % average gradient and no more than  15 % maximum on their steepest section. Total length of climbing must not be more than  25 % of the total circuit length.  Road Race Circuits  Starting Order for Road Races  Pacing / Drafting  E0121  PARA-CYCLING  49 