The event (Severn Bridge Road Race) was the first time Junior had raced alongside members of his new team Herbalife Leisure Lakes.
The race was immediately abandoned at the request of riders shortly after the incident.
More top news
Plymouth is preparing up to welcome its first Syrian Refugee families as part of a national scheme to provide sanctuary.
The wife of a high-ranking Army officer has called on the Ministry of Defence to ban an anti-malaria drug linked to mental health problems.
The chaos of last year's Black Friday has not been repeated this year as shoppers across the region opt to buy online rather than in-store.