NHTSA's encouraging, but also cautious, policy statement reflects the concerns of safety regulators about allowing drivers to take their hands off the wheel.

WSJ: Self-Driving Cars Spark New Guidelines

But Reed has also sounded a cautious tone over the last few months when asked about the high-scoring senior with NBA potential.

WSJ: Lehigh's McCollum's status in doubt for PL tourney

People are trying to invest and not be left behind by the rally, but they're also taking a very cautious approach.

WSJ: U.S. Stocks Rally to Fresh Highs

But you can also make a mistake being too cautious.

FORBES: Personality Change

In terms of risk, cash is likely to be less risky than even 'cautious' investments - but it is also unlikely to offer an interest rate that keeps pace with inflation.

BBC: Fergus Muirhead

His influence is also discernible in the review's adroit but cautious move towards nuclear disarmament.

ECONOMIST: A truce has been reached in the battle over defence cuts

But there are also worries that a newly protectionist climate is making those processing visas more cautious.

ECONOMIST: Outsourcing to India