While the fines collected through e-challans by the traffic and transport rule enforcement agencies across states have increased 450% in the past three-and-a-half years since the penalties were hiked, there has been barely 3% decline in road deaths during this period. Experts said better and scientific enforcement of rules is key to reducing road crashes and fatalities rather than focusing on slapping challans and fines.While the fines collected through e-challans by the traffic and transport rule enforcement agencies across states have increased 450% in the past three-and-a-half years since the penalties were hiked, there has been barely 3% decline in road deaths during this period. Experts said better and scientific enforcement of rules is key to reducing road crashes and fatalities rather than focusing on slapping challans and fines.