Only 63 of the 144 men who started the men 's 237.5 km road race finished .
Cookson , speaking to Reuters at the velodrome after visiting van Vleuten in hospital , said riders had to take responsibility .
Only 63 of the 144 men who started the men 's 237.5 km road race finished but Cookson , speaking to Reuters at the velodrome after visiting van Vleuten in hospital , said riders had to take responsibility .