The Policing Minister Damian Green has unveiled an overhaul of recruitment rules, which will allow new starters to join police forces at superintendent level.
He also revealed plans for a scheme to fast track candidates to become inspectors, and foreign police chiefs will be able to run British forces for the first time.
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An "erratic" driver sparked a security alert after ploughing into a police car near the US Congress and nearly mowing down several officers.
Thousands of people have linked hands on Westminster Bridge in a show of solidarity - one week after the terror attack in the capital.
PC Keith Palmer, 48, stabbed by Khalid Masood while on duty in the grounds of the Palace of Westminster last Wednesday.