Slippery road speeds — Delaware Permit Test
Slippery road speeds on the Delaware permit test — 4 rules, each with the reason behind it and a question on it while it is fresh.
The rules
Delaware's manual says to slow down at the first sign of rain, snow, or sleet, because they make the road slippery.
The first rain lifts grime off the road, and a driver who waits for a downpour has already lost grip.
Slow down at the first sign of rain, snow, or sleet.
On a wet road, Delaware's manual says to reduce your speed by about 10 mph.
Wet tires grip less than dry ones, so a car at full dry-road speed needs more room to stop than it has.
On a wet road you should reduce your speed about 10 mph.
On packed snow, Delaware's manual says to cut your speed in half.
Packed snow is far slicker than a wet road, and a small slowdown leaves the tires sliding at every stop.
On packed snow you should cut your speed in half.
On ice, Delaware's manual says you must slow to a crawl, and if at all possible not drive when roads are icy.
On ice the tires barely grip, so even a modest speed turns any touch of the brakes into a slide.
On ice, you must slow to a “crawl”.
On the test
When should you slow down for rain, snow, or sleet?
At the first sign of it. The first rain lifts grime off the road, and a driver who waits for a downpour has already lost grip. Delaware Driver Manual, p.123: “Slow down at the first sign of rain, snow, or sleet.”
How this works
Most practice tests hand you a bank of questions and leave the manual somewhere else. This one puts them together.
You read one law and the reason behind it, then answer a question on that law while it is still fresh. Get it right and you move on; get it wrong and you have found the gap while it is cheap to fix, not on the morning of the exam.
Learning one rule at a time, and proving it immediately, is what turns a manual you skimmed into something you actually know — and it makes studying feel like getting somewhere rather than like waiting to find out.
What it costs
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Where these come from
Every rule here is checked against Delaware Driver Manual, published by the Delaware Division of Motor Vehicles, and against the state code itself. Last checked 2026-10-05.
- src/assets/drivers-manuals/DE.pdf (Delaware Driver Manual, July 2026, Delaware Division of Motor Vehicles, retrieved 2026-09-14; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/DE.pages.txt (scripts/de-text.sh: plain pdftotext cropped to keep the section tab out, physical 47 under -layout; the fixture every citation here was cut from and verified against; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/DE-exam.html (Delaware Division of Motor Vehicles, Driver's License Exam, https://dmv.de.gov/DriverServices/drivers_license/index.shtml?dc=dr_lic_written, read 2026-10-05; states both exam figures; sha256 pinned under examSource)
- https://dmv.de.gov/menu/forms_manuals.shtml (read 2026-10-05; links the manual)
- https://dmv.de.gov/DriverServices/faqs/index.shtml?dc=dr_faq_general (read 2026-10-05; its 30 and 24 are the exam page's figures before 2024-12, per the Internet Archive)